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L9679ETR 데이터시트(PDF) 92 Page - STMicroelectronics

부품명 L9679ETR
상세설명  Automotive battery cut-off circuit and airbag system expansion IC
PDF  127 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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L9679ETR 데이터시트(HTML) 92 Page - STMicroelectronics

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ADC Request (ADCREQx)
Voltage Measurement
Selection
ADC Results
(ADCRESx)
Bit[6:0]
Hex
Bit[9:0]
1
0
0
0
1
1
0
0x46
SF0 pin voltage
SF0
1
0
0
0
1
1
1
0x47
SF1 pin voltage
SF1
1
0
0
1
0
0
0
0x48
SF2 pin voltage
SF2
1
0
0
1
0
0
1
0x49
SF3 pin voltage
SF3
1
0
0
1
0
1
0
0x4A
SF4 pin voltage
SF4
1
0
0
1
0
1
1
0x4B
SF5 pin voltage
SF5
1
0
0
1
1
0
0
0x4C
SF6 pin voltage
SF6
1
0
0
1
1
0
1
0x4D
SF7 pin voltage
SF7
1
0
0
1
1
1
0
0x4E
1
0
0
1
1
1
1
0x4F
1
0
1
0
0
0
0
0x50
1
0
1
0
0
0
1
0x51
Proper scaling is necessary for various measurements. The divider ratios vary by measurement and are
summarized by function in the table below.
Table 15. Diagnostics divider ratios
Measurements
Divider Ratio
15:1
10:1
7:1
4:1
1:1
SSxy
√
SFx
√
VSYNC
√
VSAT
√
TEST
√
RSUx
√
VCC
√
CVDD
√
VINT3V3
√
Bandgap (VBG1/VBG2)
√
For measurements other than voltage (current, resistance, temperature etc.) the ranges are specified in the
electrical parameters section of the relevant block.
10.1
Analog-to-digital algorithmic converter
The device hosts one integrated 10-bit analog-to-digital converter, running at a clock frequency of 16 MHz. The
ADC output is processed by a D-to-D converter with the following functions:
•
Use of trimming bits to recover additional gain error due to resistor dividers mismatch;
•
Digital low-pass filtering;
•
Conversion from 12 to 10 bits.
L9679E
System voltage diagnostics
DS12485 - Rev 8
page 92/127



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