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MM912F634CV2AP Datasheet(PDF) 147 Page - Freescale Semiconductor, Inc

Part # MM912F634CV2AP
Description  Integrated S12 Based Relay Driver with LIN
PDF  335 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MM912F634CV2AP Datasheet(HTML) 147 Page - Freescale Semiconductor, Inc

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Functional Description and Application Information
Current Sense Module - ISENSE
MM912F634
Freescale Semiconductor
147
4.20
Current Sense Module - ISENSE
The Current Sense Module is implemented to amplify the voltage drop across an external shunt resistor to measure the actual
application current using the internal Analog Digital Converter Channel 9. Typical application is the motor current in a window lift
control module
.
Figure 39. Current Sense Module with External Filter Option
The implementation is based on a switched capacitor solution to eliminate unwanted offset.To fit several application scenarios,
eight different GAIN setting are implemented.
4.20.1
Register Definition
4.20.1.1
Current Sense Register (CSR)
Table 200. Current Sense Register (CSR)
Offset(132) 0x3C
Access: User read/write
76
543
210
R
CSE
000
CCD
CSGS
W
Reset
0
000
00
00
Note:
132. Offset related to 0x0200 for blocking access and 0x300 for non blocking access within the global address space.
in
Q
C
Imot
P1
P1
P2
filt
C
filt
R
Vin
Vout
ADC
shunt
R
filt
R
in
Q
C
G ⋅
2
C
G ⋅
2
Vin
Δ
in
Q
C
Imot
P1
P1
P2
filt
C
filt
R
Vin
Vout
ADC
shunt
R
filt
R
in
Q
C
G ⋅
2
C
G ⋅
2
Vin
Δ



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