AXP288D datasheet(53/110 Pages) XPOWER

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AXP288

PMIC Optimized For Multi-Core High-Performance System

AXP288 Datasheet V1.06

Block Diagram for Battery Temperature Measurement

CHARGER

TS ADC

< VHTF

> VLTF

stop

IRQ

RNTC

REG 58_[7:0]

and

REG 59_[3:0]

REG 82_[0]=1 &

(Charging or Power on)

REG 84_[1:0]

REG 84_[2]

ADC timing

Figure 9-23

AXP288 has built in current source that can be used to inject to external thermal sensor thru TS pin for temperature

reading. This current source has 4 level of current which can be programmed through REG 84H[5:4]. By default, the current

source will only be injected when ADC is going to read the temperature data. The ADC to read TS pin input is enabled by

setting REG 82H[0] to 1. However the current source switch can be programmed to always OFF or ON or only ON when charger

is charging through REG 84H[1:0].

Table 9-38

REG 84H

Bit

Description

R/W

Default

5-4

Current source from TS pin control:

00: 20uA; 01: 40uA; 10: 60uA; 11: 80uA

1-0

Current source from TS pin on/off

enable bit [1:0]

00: off

01: on when charging battery, off

when not charging

10: on in ADC phase and off when

out of the ADC phase, for power

saving

11: always on

Table 9-39

REG 82H

Bit

Description

R/W

Default

TS pin input to ADC enable

0: off, 1: on

When the current source is injected to thermal sensor (NTC), it will create a voltage drop across NTC and this voltage will

be read by 12 bits ADC thru TS pin. The 12 bits code output of the ADC will then be stored in REG 58H (HSB 8) & REG 59H (LSB

4). The relation of TS pin voltage to 12 bits ADC output code is as below:

12 bits ADC output code = R_NTC(Ω) * REG 84[5:4]( μA) / (0.8 * 103).

AXP288D Datasheet(PDF) 53 Page - Shenzhen X-Powers Technology Co ., Ltd

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