I 2 C Register Descriptions; Telemetry Registers; Tele_Tbat - Analog Devices LINEAR LT8491 Manual

LT8491
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I C REGISTER MAP
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Note: I C register addresses 0x62 through 0x87 and 0xBE through 0xFF are reserved locations. Byte read, or Word read of these locations return
manufacturer reserved values. If the user writes these locations with new values they will not be stored.
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I C REGISTER DESCRIPTIONS

TELEMETRY REGISTERS

The telemetry registers, summarized in Table 9 and in the I
etry measured by the LT8491. These word-sized values must be read using the I
retrieving mismatched bytes (see I
the data sheet, for additional information.
Table 9. Summary of Telemetry Registers
REGISTER NAME SIZE

TELE_TBAT

WORD
TELE_POUT WORD
TELE_PIN WORD
TELE_EFF WORD
TELE_IOUT WORD
TELE_IIN WORD
TELE_VBAT WORD
TELE_VIN WORD
TELE_VINR WORD
TELE_TBAT
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I C REG ADDRESS BIT(S)
0x00 [15:0]
This register contains the most recently measured battery temperature in °C times 10 in a two's complement, signed
integer format. The value can be converted to °C by casting it to a floating-point and dividing the result by 10. The
temperature is measured on the TEMPSENSE pin via the external thermistor divider network. TELE_TBAT will report
temperatures between approximately –45°C to 65°C, but with slightly reduced accuracy outside of the –40°C to 60°C
range. The reset value of TELE_TBAT is 0x7FFF indicating that the temperature measurement has not been performed
yet. A value of 0x7777 indicates that the TEMPSENSE pin voltage is high enough to indicate that the battery has been
disconnected.
Related Data Sheet Sections: Telemetry Operation, HW Config: Battery Temperature and Disconnect Sensing
30
2
C: Data Transfer Transactions). Refer to the Telemetry Operation section, earlier in
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I C REGISTER
ADDRESS DESCRIPTION
0x00 Battery temperature measured at the TEMPSENSE pin.
0x02 Power delivered out of the charger.
0x04 Power draw from V
0x06 Charger efficiency.
0x08 Output current to V
0x0A Input current from V
0x0C V voltage.
BAT
0x0E V voltage measured at the FBIR pin.
IN
0x10 V voltage measured at the VINR pin.
IN
UNITS FORMAT
°C • 10 Unsigned Integer
For more information
2
C Register Map, are read-only and indicate the latest telem-
supply.
IN
.
BAT
.
IN
EXAMPLES DESCRIPTION
40°C = 0x0190 Indicates the temperature measured at the TEMPSENSE pin or if
–15°C = 0xFF6A the battery disconnect has been detected.
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2
C word-read transaction to avoid
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