APSPU_I2C.py

#******************************************#
# I2C address, registers and ports for UNB2c
# Created: 2021-05-11
#******************************************#

###################################
# General, Point of load converters
###################################

CTR_LBA    = 0x3C
CTR_RCU2_A = 0x3D
CTR_RCU2_D = 0x0E
CTR_POLS = {"CTR_LBA" :  0x3C,
            "CTR_RCU2_A" : 0x3D,
            "CTR_RCU2_D" : 0x3E}

LP_VOUT_MODE      = 0x20
LP_VOUT           = 0x8B #
LP_temp           = 0x8D #
LP_IOUT           = 0x8C

###################################
# Central I2C Devices
###################################
EEPROM            = 0x50

###################################
# FAN speed
###################################
MAX6620          = 0x52

REG_GLOBAL = 0x00
REG_TACH_1_MSP = 0x10
REG_TACH_1_LSP = 0x11
REG_TACH_2_MSP = 0x12
REG_TACH_2_LSP = 0x13
REG_TACH_3_MSP = 0x14
REG_TACH_3_LSP = 0x15

RUN_MONITOR = 0x80



######################
# Functions
######################

# Calculate floating point value according PMBus lineair
def calc_lin_2bytes(data):
    expo = ((data[1] & 0xf8)>>3) 
    if expo > 2**4:
        expo = expo-2**5
    mantisse = (data[1] & 0x7)*0x100 + data[0]
    output = mantisse * 2**expo
    return output

# Calculate floating point value according PMBus lineair
def calc_lin_3bytes(data,mode):
    expo = (mode[0] & 0x1F) 
    if expo > 2**4:
        expo = expo - 2**5
    output = (data[1]*256 + data[0]) * 2**expo
    return output
def tach(tach_msb, tach_lsb):
    tach_pulse_per_revolution = 2
    tach = (int(tach_msb, 16)*8) + (int(tach_lsb, 16)/32)
    rpm = 60/(tach*tach_pulse_per_revolution)
    return rpm