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L9908 データシート(PDF) 85 Page - STMicroelectronics

部品番号 L9908
部品情報  Automotive 3-Phase motor gate driver unit
PDF  152 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9908 データシート(HTML) 85 Page - STMicroelectronics

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Figure 62. T&H sampling timing diagram - zero current (offset) + command edge-triggering
5.13.2.3
Digital format current information
The current measurement is available in digital format right after the T&H block and can be read through a
dedicated SPI signal (CMn_READ in CHn_STATUS2 register).
Current Measurement reconstruction formula
Internal conversion data read-out via CMn_READ registers:
ILOADRsℎunt=ΔCM_in_LSB_15bit×DCMn_READ
(17)
Where: DCMn_READ is the digital word stored in CMn_READ and ΔCM_in_LSB_15bit is the input ADC quantization step
re-defined as follows:
ΔCM_in_LSB_15bit=CMinputADCLSB
24
(18)
Table 75. Digital format current information LSB
VCM_MAX
ΔCM_in_LSB_15bit
±7 mV
0.628 μV
±18 mV
1.256 μV
±36 mV
2.517 μV
±90 mV
6.293 μV
±160 mV
11.329 μV
±300 mV
20.141 μV
DCMn_READ coding in two`s complement.
Example:
L9908
Functional description
DS13546 - Rev 5
page 85/152



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