AS8846 datasheet(3/35 Pages) AMSCO

3 / 35 page

Data Sheet AS8446

Revision 1.8, Date 2005-03-17

Page 3 of 35

closed loop regulation timing with

µP for speed,

current and voltage control

special features e.g. suppression of particular motor

speeds, dynamical change of the over current

threshold level, etc.

Security Functions

Extensive diagnosis of the DC motor and the power FET as

well as failure handling procedures are programmable via a

µP.

•

over current detection and protection

•

no load detection of the motor

•

open wire detection (motor or power switch)

•

short circuit of the power switch detection

•

blocked motor detection and protection

•

short circuited motor segments detection and protection

•

protection of the power FET and the AS8446, if the

motor works in generator mode

•

battery voltage monitoring and over / under voltage

detection and protection

•

two over temperature detection and protection modes

external temperature sensor

on chip temperature sensor

Item (Start up values)

AS 8446

Over Voltage Threshold

40.0 V

Under Voltage Threshold

2.5 V

Minimum Charge Pump Voltage

4.0 V

Over Current Threshold (Shunt

Measurement Voltage)

125 mV

Mode after Start up

sleep

mode

Table 1

Start up values of the AS 8446

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