tpsm846c23devm-807.py

#!/usr/bin/env python3

from smbus import SMBus
# Use /dev/i2c-0
smbus = SMBus(0)
# Use PEC
smbus.pec = True

ADDR1 = 0x34
ADDR2 = 0x36


class C(object):
    OPERATION = 0x01
    ON_OFF_CONFIG = 0x02
    CLEAR_FAULTS = 0x03
    WRITE_PROTECT = 0x10
    STORE_DEFAULT_ALL = 0x11
    RESTORE_DEFAULT_ALL = 0x12
    STORE_USER_ALL = 0x15
    RESTORE_USER_ALL = 0x16
    CAPABILITY = 0x19
    SMBALERT_MASK = 0x1B
    VOUT_MODE = 0x20
    VOUT_COMMAND = 0x21
    VOUT_MAX = 0x24
    VOUT_TRANSITION_RATE = 0x27
    VOUT_SCALE_LOOP = 0x29
    VOUT_MIN = 0x2B
    VIN_ON = 0x35
    VIN_OFF = 0x36
    IOUT_CAL_OFFSET = 0x39
    VOUT_OV_FAULT_RESPONSE = 0x41
    VOUT_UV_FAULT_RESPONSE = 0x45
    IOUT_OC_FAULT_LIMIT = 0x46
    IOUT_OC_FAULT_RESPONSE = 0x47
    IOUT_OC_WARN_LIMIT = 0x4A
    OT_FAULT_LIMIT = 0x4F
    OT_FAULT_RESPONSE = 0x50
    OT_WARN_LIMIT = 0x51
    TON_DELAY = 0x60
    TON_RISE = 0x61
    TON_MAX_FAULT_LIMIT = 0x62
    TON_MAX_FAULT_RESPONSE = 0x63
    TOFF_DELAY = 0x64
    TOFF_FALL = 0x65
    STATUS_BYTE = 0x78
    STATUS_WORD = 0x79
    STATUS_VOUT = 0x7A
    STATUS_IOUT = 0x7B
    STATUS_INPUT = 0x7C
    STATUS_TEMPERATURE = 0x7D
    STATUS_CML = 0x7E
    STATUS_MFR_SPECIFIC = 0x80
    READ_VOUT = 0x8B
    READ_IOUT = 0x8C
    READ_TEMPERATURE_1 = 0x8D
    PMBUS_REVISION = 0x98
    IC_DEVICE_ID = 0xAD
    IC_DEVICE_REV = 0xAE
    MFR_SPECIFIC_00 = 0xD0
    VREF_TRIM = 0xD4
    STEP_VREF_MARGIN_HIGH = 0xD5
    STEP_VREF_MARGIN_LOW = 0xD6
    PCT_OV_UV_WRN_FLT_LIMITS = 0xD7
    OPTIONS = 0xE5
    MISC_CONFIG_OPTIONS = 0xF0


def store_default_all():
    smbus.write_byte(ADDR2, C.STORE_DEFAULT_ALL)


def restore_default_all():
    smbus.write_byte(ADDR2, C.RESTORE_DEFAULT_ALL)


def set_voltage(vol: float, verify: bool=False):
    data = int(vol * 512)
    smbus.write_word_data(ADDR2, C.VOUT_COMMAND, data)

    if verify and smbus.read_word_data(ADDR2, C.VOUT_COMMAND) != data:
        return False

    return True


def get_voltage():
    data = smbus.read_word_data(ADDR2, C.READ_VOUT)
    return data / 512


def get_current():
    mask = 0x3ff
    data1 = smbus.read_word_data(ADDR1, C.READ_IOUT)
    data2 = smbus.read_word_data(ADDR2, C.READ_IOUT)
    return ((data1 & mask) + (data2 & mask)) / 16