L9908 datasheet(85/152 Pages) STMICROELECTRONICS

部件名	L9908

功能描述	Automotive 3-Phase motor gate driver unit

PDF	152 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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85 / 152 page

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

(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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