AS8506 datasheet(24/89 Pages) AMSCO

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AS8506 – 24

ams Datasheet, Confidential:2013-Sep [1-00]

De tail ed De sc rip t ion

SAR ADC

AS8506 has a 12-bit SAR ADC to measure the cell voltage and

external temperature. The SAR ADC uses the 12-bit DAC to

generate the digital code. The SAR ADC range is 1.8V to 4.5V for

cell voltage measurement and 0.2V to 4.5V for the temperature

measurement.

Cell voltage and temperature is measured in the short trigger

phase. After the trigger goes ‘high’, compare phase starts and

then all the cell voltages and external temperature are

measured and stored in the digital registers.

Pre-Regulator

AS8506 has an internal pre-regulator, which generates supply

voltages for the internal blocks. Pre-Regulator output is used as

a supply for the oscillators. All the digital logic and the FSM will

work on the pre-regulator supply.

In SLEEP mode only the pre-regulator will be working along with

the WAKE_IN detect circuit.

Cell Threshold

AS8506 has the potential to set the two threshold levels to the

cell voltage through pins CELL_THU and CELL_THL. These

values can be set externally, (or) through OTP trim bits, (or) from

the external microcontroller by writing DAC code into the cell

threshold registers in the register space.

Weak Cell Detection

AS8506 has the ability to detect the weak cell. During load

conditions, if the cell reaches voltage of about 0.1V to -0.2V,

then this variation is detected and stored in the zero cross

detection register. This event is indicated to the master device

by a pulse on CVT_NOK_OUT pin in Compare and Balance

phase. The master device indicates the microcontroller by

setting CVT_NOK_OUT ‘high’. In WAIT mode only this will be

stored in the register; there won’t be any CVT_NOK_OUT to μC.

The register is cleared on μC reading.

External Resister Divider Control

AS8506 has the provision to enable the external divider to give

the desired cell voltage to the at VREF_IN pin. External resister

divider can be connected between VREF_H pin to ground.

Calculate the external resister divider values such that the

output of the divider will provide the desired reference value.

When comparison is not happening, this divider can be

disabled using SPI.

AS8506 Datasheet(PDF) 24 Page - ams AG

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