MAX14690.h

00001 /*******************************************************************************
00002  * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a
00005  * copy of this software and associated documentation files (the "Software"),
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00010  *
00011  * The above copyright notice and this permission notice shall be included
00012  * in all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
00015  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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00021  *
00022  * Except as contained in this notice, the name of Maxim Integrated
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00024  * Products, Inc. Branding Policy.
00025  *
00026  * The mere transfer of this software does not imply any licenses
00027  * of trade secrets, proprietary technology, copyrights, patents,
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00033 
00034 #ifndef _MAX14690_H_
00035 #define _MAX14690_H_
00036 
00037 #include "mbed.h"
00038 
00039 #define MAX14690_NO_ERROR   0
00040 #define MAX14690_ERROR      -1
00041 
00042 #define MAX14690_I2C_ADDR 0x50
00043 
00044 #define MAX14690_LDO_MIN_MV 800
00045 #define MAX14690_LDO_MAX_MV 3600
00046 #define MAX14690_LDO_STEP_MV 100
00047 
00048 #define MAX14690_OFF_COMMAND 0xB2
00049 
00050 /**
00051  * @brief MAX14690 Wearable Power-Management Solution Driver
00052  *
00053  * @details The MAX14690 is a compact power-management solutions for
00054  * space-constrained, battery-powered applications where size and efficiency are
00055  * critical. It combines a battery charger with two buck regulators, three LDOs and
00056  * a other power supervisory functions to optimize the system implementation.
00057  * <br>https://www.maximintegrated.com/en/products/power/battery-management/MAX14690.html
00058  *
00059  * @code
00060  * #include "mbed.h"
00061  * #include "MAX14690.h"
00062  *
00063  * // I2C Master 2
00064  * I2C i2cm2(I2C2_SDA, I2C2_SCL);
00065  *
00066  * MAX14690 max14690(&i2cm2);
00067  *
00068  * DigitalOut led(LED1, 0);
00069  * InterruptIn button(SW1);
00070  *
00071  * void turnOff()
00072  * {
00073  *     max14690.shutdown();
00074  * }
00075  *
00076  * int main()
00077  * {
00078  *     button.fall(&turnOff);
00079  *
00080  *     max14690.ldo2Millivolts = 3300;
00081  *     max14690.ldo3Millivolts = 3300;
00082  *     max14690.ldo2Mode = MAX14690::LDO_ENABLED;
00083  *     max14690.ldo3Mode = MAX14690::LDO_ENABLED;
00084  *     max14690.monCfg = MAX14690::MON_HI_Z;
00085  *     if (max14690.init() == MAX14690_ERROR) {
00086  *         printf("Error initializing MAX14690");
00087  *     }
00088  *
00089  *     Thread::wait(500);
00090  *
00091  *     while(1) {
00092  *         led1 = !led1;
00093  *         Thread::wait(500);
00094  *     }
00095  * }
00096  * @endcode
00097  */
00098 class MAX14690
00099 {
00100 public:
00101 
00102     /**
00103      * @brief   Register Addresses
00104      * @details Enumerated MAX14690 register addresses
00105      */
00106     enum registers_t {
00107         REG_CHIP_ID = 0x00,     ///< Chip ID
00108         REG_CHIP_REV = 0x01,    ///< Chip Revision
00109         REG_STATUS_A = 0x02,   ///< Status Register A
00110         REG_STATUS_B = 0x03,   ///< Status Register B
00111         REG_STATUS_C = 0x04,   ///< Status Register C
00112         REG_INT_A = 0x05,   ///< Interrupt Register A
00113         REG_INT_B = 0x06,   ///< Interrupt Register B
00114         REG_INT_MASK_A = 0x07,   ///< Interrupt Mask A
00115         REG_INT_MASK_B = 0x08,   ///< Interrupt Mask B
00116         REG_I_LIM_CNTL = 0x09,   ///< Input Limit Control
00117         REG_CHG_CNTL_A = 0x0A,   ///< Charger Control A
00118         REG_CHG_CNTL_B = 0x0B,   ///< Charger Control B
00119         REG_CHG_TMR = 0x0C,   ///< Charger Timers
00120         REG_BUCK1_CFG = 0x0D,   ///< Buck 1 Configuration
00121         REG_BUCK1_VSET = 0x0E,   ///< Buck 1 Voltage Setting
00122         REG_BUCK2_CFG = 0x0F,   ///< Buck 2 Configuration
00123         REG_BUCK2_VSET = 0x10,   ///< Buck 2 Voltage Setting
00124         REG_RSVD_11 = 0x11,   ///< Reserved 0x11
00125         REG_LDO1_CFG = 0x12,   ///< LDO 1 Configuration
00126         REG_LDO1_VSET = 0x13,   ///< LDO 1 Voltage Setting
00127         REG_LDO2_CFG = 0x14,   ///< LDO 2 Configuration
00128         REG_LDO2_VSET = 0x15,   ///< LDO 2 Voltage Setting
00129         REG_LDO3_CFG = 0x16,   ///< LDO 3 Configuration
00130         REG_LDO3_VSET = 0x17,   ///< LDO 3 Voltage Setting
00131         REG_THRM_CFG = 0x18,   ///< Thermistor Configuration
00132         REG_MON_CFG = 0x19,   ///< Monitor Multiplexer Configuration
00133         REG_BOOT_CFG = 0x1A,   ///< Boot Configuration
00134         REG_PIN_STATUS = 0x1B,   ///< Pin Status
00135         REG_BUCK_EXTRA = 0x1C,   ///< Additional Buck Settings
00136         REG_PWR_CFG = 0x1D,   ///< Power Configuration
00137         REG_NULL = 0x1E,   ///< Reserved 0x1E
00138         REG_PWR_OFF = 0x1F,   ///< Power Off Register
00139     };
00140 
00141     /**
00142      * @brief   Thermal Status
00143      * @details Thermal status determined by thermistor
00144      */
00145     enum thermStat_t {
00146         THMSTAT_000,    ///< T < T1
00147         THMSTAT_001,    ///< T1 < T < T2
00148         THMSTAT_010,    ///< T2 < T < T3
00149         THMSTAT_011,    ///< T3 < T < T4
00150         THMSTAT_100,    ///< T > T4
00151         THMSTAT_101,    ///< No theremistor detected
00152         THMSTAT_110,    ///< Thermistor Disabled by ThermEn
00153         THMSTAT_111,    ///< CHGIN not present
00154     };
00155 
00156     /**
00157      * @brief   Charge Status
00158      * @details Current operating mode of charger
00159      */
00160     enum chgStat_t {
00161         CHGSTAT_000,    ///< Charger off
00162         CHGSTAT_001,    ///< Charging suspended by temperature
00163         CHGSTAT_010,    ///< Pre-charge
00164         CHGSTAT_011,    ///< Fast-charge constant current
00165         CHGSTAT_100,    ///< Fast-charge constant voltage
00166         CHGSTAT_101,    ///< Maintain charge
00167         CHGSTAT_110,    ///< Done
00168         CHGSTAT_111,    ///< Charger fault
00169     };
00170 
00171     /**
00172      * @brief   Input Current Limit
00173      * @details CHGIN input current limit values
00174      */
00175     enum iLimCntl_t {
00176         ILIM_0mA,       ///< 0mA
00177         ILIM_100mA,     ///< 100mA
00178         ILIM_500mA,     ///< 500mA
00179         ILIM_1000mA,        ///< 1000mA
00180     };
00181 
00182     /**
00183      * @brief   Recharge Threshold
00184      * @details Battery recharge voltage threshold
00185      */
00186     enum batReChg_t {
00187         BAT_RECHG_70mV,     ///< 70mV
00188         BAT_RECHG_120mV,        ///< 120mV
00189         BAT_RECHG_170mV,        ///< 170mV
00190         BAT_RECHG_220mV,        ///< 220mV
00191     };
00192 
00193     /**
00194      * @brief   Battery Regulation Voltage
00195      * @details Battery regulation voltages set point
00196      */
00197     enum batReg_t {
00198         BAT_REG_4050mV,     ///< 4.05V
00199         BAT_REG_4100mV,     ///< 4.10V
00200         BAT_REG_4150mV,     ///< 4.15V
00201         BAT_REG_4200mV,     ///< 4.20V
00202         BAT_REG_4250mV,     ///< 4.25V
00203         BAT_REG_4300mV,     ///< 4.30V
00204         BAT_REG_4350mV,     ///< 4.35V
00205         BAT_REG_RSVD,       ///< reserved
00206     };
00207 
00208     /**
00209      * @brief   Precharge Voltage
00210      * @details Battery precharge voltage threshold
00211      */
00212     enum vPChg_t {
00213         VPCHG_2100mV,       ///< 2.10V
00214         VPCHG_2250mV,       ///< 2.25V
00215         VPCHG_2400mV,       ///< 2.40V
00216         VPCHG_2550mV,       ///< 2.55V
00217         VPCHG_2700mV,       ///< 2.70V
00218         VPCHG_2850mV,       ///< 2.85V
00219         VPCHG_3000mV,       ///< 3.00V
00220         VPCHG_3150mV,       ///< 3.15V
00221     };
00222 
00223     /**
00224      * @brief   Precharge Current
00225      * @details Battery precharge current value
00226      */
00227     enum iPChg_t {
00228         IPCHG_5,        ///< 5% of Ifchg
00229         IPCHG_10,       ///< 10% of Ifchg
00230         IPCHG_20,       ///< 20% of Ifchg
00231         IPCHG_30,       ///< 30% of Ifchg
00232     };
00233 
00234     /**
00235      * @brief   Done Current
00236      * @details Charger done current where charging stops
00237      */
00238     enum chgDone_t {
00239         CHGDONE_5,      ///< 5% of Ifchg
00240         CHGDONE_10,     ///< 10% of Ifchg
00241         CHGDONE_20,     ///< 20% of Ifchg
00242         CHGDONE_30,     ///< 30% of Ifchg
00243     };
00244 
00245     /**
00246      * @brief   Maintain Charge Timer
00247      * @details Timeout settings for maintain charge mode
00248      */
00249     enum mtChgTmr_t {
00250         MTCHGTMR_0min,      ///< 0 min
00251         MTCHGTMR_15min,     ///< 15 min
00252         MTCHGTMR_30min,     ///< 30 min
00253         MTCHGTMR_60min,     ///< 60 min
00254     };
00255 
00256     /**
00257      * @brief   Fast Charge Timer
00258      * @details Timeout settings for fast charge mode
00259      */
00260     enum fChgTmr_t {
00261         FCHGTMR_75min,      ///< 75 min
00262         FCHGTMR_150min,     ///< 150 min
00263         FCHGTMR_300min,     ///< 300 min
00264         FCHGTMR_600min,     ///< 600 min
00265     };
00266 
00267     /**
00268      * @brief   Precharge Timer
00269      * @details Timeout settings for precharge mode
00270      */
00271     enum pChgTmr_t {
00272         PCHGTMR_30min,      ///< 30 min
00273         PCHGTMR_60min,      ///< 60 min
00274         PCHGTMR_120min,     ///< 120 min
00275         PCHGTMR_240min,     ///< 240 min
00276     };
00277 
00278     /**
00279      * @brief   LDO Enable Mode
00280      * @details Enumerated enable modes for voltage regulators
00281      */
00282     enum ldoMode_t {
00283         LDO_DISABLED,   ///< Disabled, Regulator Mode
00284         SW_DISABLED,    ///< Disabled, Switch Mode
00285         LDO_ENABLED,    ///< Enabled, Regulator Mode
00286         SW_ENABLED, ///< Enabled, Switch Mode
00287         LDO_EN_MPC0,    ///< Regulator Enabled by MPC pin
00288         SW_EN_MPC0, ///< Switch Enabled by MPC pin
00289         LDO_EN_MPC1,    ///< Regulator Enabled by MPC pin
00290         SW_EN_MPC1, ///< Switch Enabled by MPC pin
00291         LDO_DISABLED_DSC,   ///< Regulator Disabled
00292         SW_DISABLED_DSC,    ///< Switch Disabled
00293         LDO_ENABLED_DSC,    ///< Regulator Enabled
00294         SW_ENABLED_DSC, ///< Switch Enabled
00295         LDO_EN_MPC0_DSC,    ///< Regulator Enabled by MPC pin
00296         SW_EN_MPC0_DSC, ///< Switch Enabled by MPC pin
00297         LDO_EN_MPC1_DSC,    ///< Regulator Enabled by MPC pin
00298         SW_EN_MPC1_DSC, ///< Switch Enabled by MPC pin
00299     };
00300 
00301     /**
00302      * @brief   Buck Operating Modes
00303      * @details Enumerated operating modes for buck regulator
00304      */
00305     enum buckMd_t {
00306         BUCK_BURST,     ///< Burst Mode Operation
00307         BUCK_FPWM,      ///< Forced PWM Operation
00308         BUCK_MPC0_FPWM, ///< MPC activated Forced PWM
00309         BUCK_MPC1_FPWM, ///< MPC activated Forced PWM
00310     };
00311 
00312     /**
00313      * @brief   Thermistor Configuration
00314      * @details Enumerated thermistor operating modes
00315      */
00316     enum thrmCfg_t {
00317         THRM_DISABLED,      ///< Thermistor monitoring disabled
00318         THRM_ENABLED,       ///< Basic thermistor monitoring 
00319         THRM_RSVD,  ///< reserved, do not use
00320         THRM_JEITA, ///< JEITA thermistor monitoring
00321     };
00322 
00323     /**
00324      * @brief   Monitor Configurations
00325      * @details Enumerated configuration modes for monitor multiplexer
00326      */
00327     enum monCfg_t {
00328         MON_PULLDOWN = 0x0, ///< Pulled down by 100k Ohm
00329         MON_BAT = 0x1,      ///< BAT Selected
00330         MON_SYS = 0x2,      ///< SYS Selected
00331         MON_BUCK1 = 0x3,    ///< BUCK1 Selected
00332         MON_BUCK2 = 0x4,    ///< BUCK2 Selected
00333         MON_LDO1 = 0x5,     ///< LDO1 Selected
00334         MON_LDO2 = 0x6,     ///< LDO2 Selected
00335         MON_LDO3 = 0x7,     ///< LDO3nSelected
00336         MON_HI_Z = 0x8,     ///< High Impedance
00337     };
00338 
00339     /**
00340      * @brief   Monitor Divide Ratio
00341      * @details Ratio settings for monitor divider
00342      */
00343     enum monRatio_t {
00344         MON_DIV4,       ///< 4:1 Monitor Ratio
00345         MON_DIV3,       ///< 3:1 Monitor Ratio
00346         MON_DIV2,       ///< 2:1 Monitor Ratio
00347         MON_DIV1,       ///< 1:1 Monitor Ratio
00348     };
00349 
00350     /**
00351         * MAX14690 constructor.
00352         *
00353         * @param i2c I2C object to use.
00354         */
00355     MAX14690(I2C *i2c);
00356 
00357     /**
00358         * MAX14690 destructor.
00359         */
00360     ~MAX14690();
00361 
00362     /**
00363      * @brief   Initialize MAX14690
00364      * @details Applies settings to MAX14690.
00365      *  Settings are stored in public variables.
00366      *  The variables are pre-loaded with the most common configuation.
00367      *  Assign new values to the public variables before calling init.
00368      *  This will update all the settings including the LDO voltages 
00369      *  and modes.
00370      * @returns 0 if no errors, -1 if error.
00371     */
00372     int init();
00373 
00374     /**
00375      * @brief   Set the LDO Voltage
00376      * @details Sets the voltage for the boost regulator.
00377      *  The voltage is specified in millivolts.
00378      *  The MAX14690 cannot update the voltage when enabled.
00379      *  This function checks the local ldoMode variable and if the
00380      *  regualtor is enabled it will send the disable command before
00381      *  sending the new voltage and re-enable the LDO after
00382      *  the new voltage is written.
00383      * @param   mV voltage for boost regualtor in millivolts
00384      * @returns 0 if no errors, -1 if error.
00385     */
00386     int ldo2SetVoltage(int mV);
00387 
00388     /**
00389      * @brief   Set LDO Enable Mode
00390      * @details Sets the enable mode for the LDO/SW
00391      * @param   mode The enable mode for the LDO/SW
00392      * @returns 0 if no errors, -1 if error.
00393     */
00394     int ldo2SetMode(ldoMode_t mode);
00395 
00396     /**
00397      * @brief   Set the LDO Voltage
00398      * @details Sets the voltage for the boost regulator.
00399      *  The voltage is specified in millivolts.
00400      *  The MAX14690 cannot update the voltage when enabled.
00401      *  This function checks the local ldoMode variable and if the
00402      *  regualtor is enabled it will send the disable command before
00403      *  sending the new voltage and re-enable the LDO after
00404      *  the new voltage is written.
00405      * @param   mV voltage for boost regualtor in millivolts
00406      * @returns 0 if no errors, -1 if error.
00407     */
00408     int ldo3SetVoltage(int mV);
00409 
00410     /**
00411      * @brief   Set LDO Enable Mode
00412      * @details Sets the enable mode for the LDO/SW
00413      * @param   mode The enable mode for the LDO/SW
00414      * @returns 0 if no errors, -1 if error.
00415     */
00416     int ldo3SetMode(ldoMode_t mode);
00417 
00418     /**
00419      * @brief   Configure Mon Pin
00420      * @details Configures the operating mode of the monitor multiplexer
00421      * @param   monCfg The configuration mode for the monitor pin
00422      * @returns 0 if no errors, -1 if error.
00423     */
00424     int monSet(monCfg_t monCfg, monRatio_t monRatio);
00425 
00426     /**
00427      * @brief   Shutdown
00428      * @details Sends the command to turn off all supplies and put the part
00429      *  in battery saving shelf mode.
00430      * @returns 0 if no errors, -1 if error.
00431     */
00432     int shutdown();
00433 
00434     /**
00435      * @brief   Reset settings to default values
00436      * @details Resets all local variables to the default value.
00437      *  Note: this only resets the local variables and has no effect 
00438      *  on the part until they are applied by another functions such as
00439      *  init();
00440      * @returns 0 if no errors, -1 if error.
00441     */
00442     void resetToDefaults();
00443 
00444     /**
00445      * @brief   Write Register
00446      * @details Writes the given value to the specified register.  
00447      *  Note, this function provides direct access to the registers
00448      *  without any awareness or effect on the settings stored in 
00449      *  the public variables.  This is used by the other functions to
00450      *  set the values inside the MAX14690.  Calling this outside of the 
00451      *  other functions can break the synchronization of the variables
00452      *  to the state of the MAX14690.
00453      * @param   reg The register to be written
00454      * @param   value The data to be written
00455      * @returns 0 if no errors, -1 if error.
00456     */
00457     int writeReg(registers_t reg, char value);
00458 
00459     /**
00460      * @brief   Read Register
00461      * @details Reads from the specified register
00462      * @param   reg The register to be read
00463      * @param   value Pointer for where to store the data
00464      * @returns 0 if no errors, -1 if error.
00465     */
00466     int readReg(registers_t reg, char *value);
00467 
00468     /// Thermal Status Change Interrupt Enable: default 0 - Disabled, 1 - Enabled
00469     bool intEnThermStatus;
00470     /// Charger Status Change Interrupt Enable: default 0 - Disabled, 1 - Enabled
00471     bool intEnChgStatus;
00472     /// Input Limit Interrupt Enable: default 0 - Disabled, 1 - Enabled
00473     bool intEnILim;
00474     /// USB Over Voltage Interrupt Enable: default 0 - Disabled, 1 - Enabled
00475     bool intEnUSBOVP;
00476     /// USB OK Interrupt Enable: default 0 - Disabled, 1 - Enabled
00477     bool intEnUSBOK;
00478     /// Charger Thermal Shutdown Interrupt Enable: default 0 - Disabled, 1 - Enabled
00479     bool intEnChgThmSD;
00480     /// Thermal Regulation Interrupt Enable: default 0 - Disabled, 1 - Enabled
00481     bool intEnThermReg;
00482     /// Charger Timeout Interrupt Enable: default 0 - Disabled, 1 - Enabled
00483     bool intEnChgTimeOut;
00484     /// Buck1 Thermal Error Interrupt Enable: default 0 - Disabled, 1 - Enabled
00485     bool intEnThermBuck1;
00486     /// Buck2 Thermal Error Interrupt Enable: default 0 - Disabled, 1 - Enabled
00487     bool intEnThermBuck2;
00488     /// LDO1 Thermal Error Interrupt Enable: default 0 - Disabled, 1 - Enabled
00489     bool intEnThermLDO1;
00490     /// LDO2 Thermal Error Interrupt Enable: default 0 - Disabled, 1 - Enabled
00491     bool intEnThermLDO2;
00492     /// LDO3 Thermal Error Interrupt Enable: default 0 - Disabled, 1 - Enabled
00493     bool intEnThermLDO3;
00494     /// CHGIN Input Current Limit Setting: default 500mA
00495     iLimCntl_t iLimCntl;
00496     /// Charger Auto Stop: default 1 - move to Charge Done when charging complete, 0 - remain in Maintain Charge mode
00497     bool chgAutoStp;
00498     /// Charger Auto Restart: default 1 - restart charging when Vbat drops below threshold, 0 - stay in Charge Done until charging disabled 
00499     bool chgAutoReSta;
00500     /// Charger Battery Recharge Threshold: default -120mV
00501     batReChg_t batReChg;
00502     /// Charger Battery Regulation Voltage: default 4.20V
00503     batReg_t batReg;
00504     /// Charger Enable: default 1 - Enabled, 0 - Disabled
00505     bool chgEn;
00506     /// Charger Precharge Voltage Threshold: default 3.00V
00507     vPChg_t vPChg;
00508     /// Charger Precharge Current Setting: default 10% of fast charge current
00509     iPChg_t iPChg;
00510     /// Charger Done Threshold, stop charging when charge current drops to this level: default 10% of fast charge current
00511     chgDone_t chgDone;
00512     /// Maintain Charge Timer, time to wait after reaching done current before disabling charger: default 0 min
00513     mtChgTmr_t mtChgTmr;
00514     /// Fast Charge Timer, timeout for fast charge duration: default 300 min
00515     fChgTmr_t fChgTmr;
00516     /// Precharge Timer, timeout for precharge duration: default 60 min
00517     pChgTmr_t pChgTmr;
00518     /// Buck 1 Mode Select: default Burst mode
00519     buckMd_t buck1Md;
00520     /// Buck 1 Inductor Select: default 0 - 2.2uH, 1 - 4.7uH
00521     bool buck1Ind;
00522     /// Buck 2 Mode Select: default BUCK_BURST
00523     buckMd_t buck2Md;
00524     /// Buck 2 Inductor Select: default 0 - 2.2uH, 1 - 4.7uH
00525     bool buck2Ind;
00526     /// LDO 2 Mode Select: default LDO_DISABLED
00527     ldoMode_t ldo2Mode;
00528     /// LDO 2 Voltage in millivolts: default 3200
00529     int ldo2Millivolts;
00530     /// LDO 3 Mode Select: default LDO_DISABLED
00531     ldoMode_t ldo3Mode;
00532     /// LDO 3 Voltage in millivolts: default 3000
00533     int ldo3Millivolts;
00534     /// Thermistor Configuration: default THRM_ENABLED
00535     thrmCfg_t thrmCfg;
00536     /// Monitor Multiplexer Divider Ratio Select: default MON_DIV4
00537     monRatio_t monRatio;
00538     /// Monitor Multiplexer Configuration: default MON_PULLDOWN
00539     monCfg_t monCfg;
00540     /// Buck 2 Active Discharge: default 0 - discharge only during hard reset, 1 - discharge when regulator is disabled
00541     bool buck2ActDsc;
00542     /// Buck 2 Force FET Scaling: default 0 - full FET for better active efficiency, 1 - reduced FET for lower quiescent current
00543     bool buck2FFET;
00544     /// Buck 1 Active Discharge: default 0 - discharge only during hard reset, 1 - discharge when regulator is disabled
00545     bool buck1ActDsc;
00546     /// Buck 1 Force FET Scaling: default 0 - full FET for better active efficiency, 1 - reduced FET for lower quiescent current
00547     bool buck1FFET;
00548     /// PFN pin resistor enable: default 1 - internal pullup/pulldown enabled, 0 - internal pullup/pulldown disabled 
00549     bool pfnResEna;
00550     /// Stay On Handshake: default 1 - remain on, 0 - turn off if not set within 5s of power-on 
00551     bool stayOn;
00552 
00553 private:
00554     // Internal Resources
00555     I2C *_i2c;
00556 
00557     /**
00558      * @brief   Converts mV to register bits
00559      * @details Converts integer representing the desired voltage 
00560      *  in millivolts to the coresponding 8 bit register value.
00561      *  This will check to ensure the voltage is within the allowed 
00562      *  range and return an error (-1) if it is out of range.
00563      * @param   mV voltage for LDO regulator in millivolts
00564      * @returns 8 bit register value if no errors, -1 if error.
00565     */    
00566     int mv2bits(int mV);
00567 };
00568 
00569 #endif /* _MAX14690_H_ */