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AS8846 Datasheet

  • AS8846

  • Programmable PWM DC Motor Driver / Controller

  • 35頁

  • AMSCO

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Data Sheet AS8446
AS 8446
Programmable PWM DC Motor Driver / Controller
DATA SHEET
Key Features
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Programmable PWM DC Motor Driver / Controller with 碌P
Interface (Three Wire Interface)
Programmable Functions and Parameters for Motor
Current, Voltage and Speed Regulation
Single Voltage Supply in the range
Vbat = 6.0 V to 18 V (Vbat,max = 30 V)
1
Total Power Efficiency up to 96 %
Low RF Emission within the whole frequency range due to
an integrated special EMC optimized driver
Dynamically self-adjusting slew rate regulated switching
technology
Fully protected by programmable failure handling
procedures via 碌P
Fast Over Current and Over / Under Voltage Detection
and Protection, Battery Voltage Monitoring
External and On Chip Temperature Detection and
Protection
Motor Current and Speed Measurement with a shunt
resistor and capability of trimming the chip for an external
shunt value
Programmable Parameters:
鈥?/div>
EMC compliant Driver Functions
鈥?/div>
Over Current, Over / Under Voltage
Threshold Values
鈥?/div>
Motor Failure Threshold Levels
鈥?/div>
Motor Current Measurement Range
鈥?/div>
Trimming for the current measurement shunt
WakeUp
It is an advanced PWM DC motor controller subsystem with
an excellent EMC behavior targeted especially for high
current automotive applications. The optimization of the EMC
behavior of the entire module only by software changes
makes it easier to implement it in harsh environments.
The programmability of parameters and functions allows the
adaptation of the AS8446 to a wide range of applications.
So the system can act either as a motor current or motor
speed or motor voltage regulator. Also a full diagnosis of
motor failures and power FET failures, over temperature and
over/under voltage can be formed by programmable failure
handling procedures using the motor characteristic and the
real time measured motor current, motor speed and battery
voltage.
Applications
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Fan cooler
Air conditioning
Fuel pumps
Water and oil pumps
General purpose DC Motor Regulators
Typical Application Diagram
Control part
Power part
Cbat
1
2
3
4
5
Vbat
AS8446
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OSC1
VDD
CLK
GND
Port1
Port2
9
10
11
12
Wake-up
n.c.
Test1
Test2
Iref
20
RESET
19
WD
18
Test3
17
PWM
16
CLK
15
Rref
R
T1
R
NTC
Sleep / Wake-up Mode system controlled by the
碌P
and
the Wake-up Pin
SOIC 28 Package
CVDD
鈥?/div>
PWM Frequency, Charge Pump Monitor
Charge Pump to control high side drivers
Integrated 5 V Power Supply for external components
(碌P, etc.)
Standby and Wake-up capability
CMN
CMP
VMO
Vbat
TP
FAIL
CS
ADC
VSS
28
GND_P
27
OUT
26
Tr1
CP12
CP0
Rmeas
Vpump
25
CP2
24
CP1
23
VDDctrl
22
VDD
21
VDD = 5 V
PWMout
INR
CS
ANA
6
7
8
碌P
(optional)
Q1
OSC2
D1
M+
M
M-
VSS
RESET
Tout
SPIout
SPIin
13
DATAin
14
DATAout
General Description
The AS8446 is a complete and fully protected PWM DC motor
driver/controller, which can be implemented by interfacing a
low cost 8-bit
碌P
and a high-side N-channel power FET
switch.
GND_P
1
Low-Batttery-mode between 6.0 V and 6.5 V
Revision 1.8, Date 2005-03-17
Page 1 of 35

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