AXP209 datasheet(25/45 Pages) ETC2

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AXP209

Enhanced single Cell Li-Battery and Power System Management IC

9.7 Signal Acquisition System

Simple battery monitors estimate the battery energy by measuring the battery voltage. However, the

multiple 12-bit ADCs in the AXP209 can measure battery voltage, as well as battery current and

external power voltage and current. It integrates battery charge and discharge coulomb counter. Using

this data, the Host is capable of calculating accurately the battery energy and other battery data, such

as the system real-time consumption, remaining battery energy, battery charge progress, remaining

battery using time and charge time, etc.

The enabled state and sampling rate of each ADC can be set via registers REG82H, 83H, 84H. The

sampling results will be saved in corresponding registers, and reference can be made to the

ADC data in Register Instruction section. The input range of GPIO[1:0] can be set via register

REG85H, while register REG00H[2] is used to indicate the battery charge/discharge current directions.

Channel

000H

STEP

FFFH

Battery Voltage

0mV

1.1mV

4.5045V

Bat discharge current

0mA

0.5mA

4.095A

Bat charge current

0mA

0.5mA

4.095A

ACIN voltage

0mV

1.7mV

6.9615V

ACIN current

0mA

0.625mA

2.5594A

VBUS voltage

0mV

1.7mV

6.9615V

VBUS current

0mA

0.375mA

1.5356A

Internal temperature

-144.7C

0.1C

264.8C

APS voltage

0mV

1.4mV

5.733V

TS pin input

0mV

0.8mV

3.276V

GPIO0

0 / 0.7V

0.5mV

2.0475 / 2.7475V

GPIO1

0 / 0.7V

0.5mV

2.0475 / 2.7475V

9.8 Multifunction Pin Description(Multi-Function Pin Description)

GPIO [3: 0]

GPIO[3:0] Can be defined as ADC Input (monitoring external signals), or LDO, etc. Please refer to

REG90H-96H Instruction for details.

CHGLED

Features charge state indication, over-temperature/over-voltage warning, and GPO. Please refer to

REG32H Instruction section for details.

9.9 Timer

AXP209 Contains a 7 bit Internal timer, the value is set by register REG8AH [6: 0]. If the register is set to 0,

the timer is disabled. If REG8AH [6: 0] = A, The timer starts count from 0 to A and sets REG8AH [7], also

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