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PDF AS8846 Data sheet ( Hoja de datos )
| Número de pieza | AS8846 | |
| Descripción | Programmable PWM DC Motor Driver / Controller | |
| Fabricantes | AMSCO | |
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Data Sheet AS8446
AS 8446
Programmable PWM DC Motor Driver / Controller
DATA SHEET
Key Features
- Programmable PWM DC Motor Driver / Controller with µP
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 µP
- 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:
• EMC compliant Driver Functions
• Over Current, Over / Under Voltage
Threshold Values
• Motor Failure Threshold Levels
• Motor Current Measurement Range
• Trimming for the current measurement shunt
• PWM Frequency, Charge Pump Monitor
- Charge Pump to control high side drivers
- Integrated 5 V Power Supply for external components
(µP, etc.)
- Standby and Wake-up capability
- Sleep / Wake-up Mode system controlled by the µP and
the Wake-up Pin
- SOIC 28 Package
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 µP and a high-side N-channel power FET
switch.
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
- Fan cooler
- Air conditioning
- Fuel pumps
- Water and oil pumps
- General purpose DC Motor Regulators
Typical Application Diagram
Control part
(optional)
Q1
PWMout
INR
µP CS
OSC2
ANA
OSC1
CLK
VDD
GND
Port1
Port2
RESET SPIout
Tout
SPIin
1 CMN
VSS 28
2 CMP
3 VMO
4 Vbat
5 TP
6 FAIL
GND_P 27
OUT 26
Vpump 25
CP2 24
CP1 23
7 CS
VDDctrl 22
8 ADC
VDD 21
9 Wake-up
Iref 20
10 n.c.
RESET 19
11 Test1
WD 18
12 Test2
Test3 17
13 DATAin
PWM 16
14 DATAout
CLK 15
CP12 CP0
VDD = 5 V
Rref
RT1
RNTC
VSS
Power part Vbat
Cbat
Tr1
D1
M+
M
M-
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
1 page  
Data Sheet AS8446
Block Diagram
Figure 2 Block Diagram of AS8446
Revision 1.8, Date 2005-03-17
Page 5 of 35
5 Page 
Data Sheet AS8446
Rising edge (switch on): Programmable Gate Drive Source Currents (13 bit)
Register / timing
Programmable range
Programmable range
Unit Note
part of rising edge
R1<4:0> = SRon
R6<0> = 1, Acu_on/off
min max step
0 496 16
R6<0> = 0, Acu_on/off
min max step
0 248 8
mA R1 = 0, 1, 2, … 31
(Vmotor = 12.7 V)
R1<4:0> = SRon
0
(1240)1
40
0
(620)1
20 mA
(Vmotor = 30.7 V)
R2<3:0> = SRon_stat
1.0
32
1.0 0.5 16 0.5 mA R2 = 0, 1, 2, … 15
R3<2:0> = SRon_min
20
160
20
10
80 10 mA R3 = 0, 1, 2, … 7
(Vmotor = -0.5 V)
Note (1): The total driver current Iout_on must be limited to 500 mA (Iout_on < 500 mA ) in the real application with the given
Vmotor_max = Vbat by appropriate programming.
Table 11 Programming of the slew rate parameters (rising edge)
Figure 5 Rising edge of the motor voltage before and after the EMC optimization
Revision 1.8, Date 2005-03-17
Page 11 of 35
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AS8846.PDF ] | |
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