AS8506 datasheet(22/89 Pages) AMSCO

22 / 89 page

AS8506 – 22

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

De tail ed De sc rip t ion

The device consists of the following blocks:

• PWM driver

• LDO_5V with 5V / 50mA output

• Temperature monitor block

• High precision bandgap reference

• DAC for the reference voltage generation

• SAR ADC for cell voltage and external temperature

measurement

• Oscillators for PWM drive and for the digital logic

•Pre-Regulator

• SC Comparator

• Weak cell detection logic

• PORs on different supplies

Voltage Regulator (LDO_5V)

Power input to the LDO is VSUP pin. It is switched ON when the

device is in NORMAL mode and switched OFF in SLEEP mode.

The LDO takes the input from Bandgap and scales it up to the

required voltage. It starts charging only after entering NORMAL

mode. This LDO is the supply for DAC, the PWM driver and Cell

voltage comparators.It’s additional features are as follows:

• Stability is better than ±2.5% over input range.

• Load current up to 50mA.

High Precision Bandgap (HPBG)

AS8506 has a high precision bandgap to generate accurate

reference. This reference voltage is used to generate reference

for DAC and ADC.

HPBG is trimmed with respect to temperature. Variation of the

bandgap with temperature is ±3mV in the temperature range

from -40ºC to 115ºC.

External Temperature Monitor and

Measurement

Two sensor inputs TEMP_IN1 and TEMP_IN2 with a comparator

on each pin, are available. If the temperature sensor connected

to TEMP_IN1 crosses its threshold, then a warning flag is set in

the device (status can be read through SPI) and the device will

continue balancing.

If the temperature sensor connected to TEMP_IN2 crosses its

threshold, then a flag is set in the device and balancing is

stopped; but the device continues to stay in NORMAL mode for

maintaining synchronism. In both the cases, the

microcontroller will be interrupted by a pulse on

CVT_NOK_OUT pin.

Detailed Description

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