AS8525 datasheet(2/38 Pages) AMSCO

2 / 38 page

AS8525

LIN Transceiver with Voltage Regulators, Programmable Gain High

Side Amplifier, and Voltage Attenuator

www.ams.com/AS8525

Revision 2.3

1 - 37

1 General Description

The AS8525 is a companion IC for automotive battery sensor

systems for both low-side and high-side current sensing

applications.

The device provides two regulated 3.3V (or 5V) supplies from the

battery supply, attenuated battery voltage in differential form, and

amplified version of a high-side current-sense element’s voltage with

a translated common-mode voltage. The device also communicates

the system output to a LIN bus.

AS8525 is designed in a high-voltage 0.35µm CMOS process and

packaged on QFN-32.

2 Key Features



Operating voltage 4.3V to 18V, max. 42V for 500 ms



Two linear low-drop voltage regulators: VCC = 3.3V or 5V as a

factory programming option with 50mA drive capability



Typical 50µA quiescent current in standby mode



Typical 35µA quiescent current in sleep mode



Precision voltage attenuator with power down facility

- 0.2% ratio drift accuracy and disable



Precision fully-differential programmable gain amplifier (PGA)

- High-voltage to low-voltage common-mode translation

- Gain steps 5, 25, 50, 100



LIN bus transceiver

- Load independent slew control conforming to LIN 2.1

- Short circuit protection

- TX time out fail safe feature

- Over temperature warning and shut down



Power-On Reset with OTP adjustable reset timeout and brown-

out detection



Over temperature warning & shutdown functions



Operating modes: Normal, Standby, Sleep, Temporary shut

down



Microcontroller 4-wire interface



RC oscillator and programmable timer



Optional window watchdog in normal mode and time-out

watchdog in standby mode



8 backup registers to store MCU data during VCC shut down



Load dump protection for all battery supplied pins, LIN bus pin

and Enable pin



Internal reverse polarity protection (up to -27V) for all battery-

sensing pins and LIN bus pin



Chip ID for traceability



-40ºC to +125ºC ambient operating temperature



32-pin QFN (5x5) package

3 Applications

The AS8525 is suitable for LIN networked 14V battery sensor slaves

for current measurement in positive battery power rail (high side) or

in minus rail (PGA is left un-used in that case).

The device is also ideal for general purpose system basis chip for

actuator LIN slaves with battery voltage sensing and actuator high

side current sensing.

AS8525 数据表(PDF) 2 Page - ams AG

AS8525 数据表(HTML) 2 Page - ams AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

数据表下载