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L9908 데이터시트(PDF) 103 Page - STMicroelectronics

부품명 L9908
상세설명  Automotive 3-Phase motor gate driver unit
PDF  153 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
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Figure 78. Temperature monitor ADC characteristics
The temperature measurement data are stored in a dedicated register and can be retrieved by SPI readout of
TEMP_READ in the register GEN_TEMP_STATUS.
The temperature can be retrieved by the following formula:
Tj C∘ = 1.37C∘×DTEMP_READ −77.4C∘
(25)
Where: DTEMP_READ is the digital word stored in TEMP_READ.
The digitized temperature information is compared by two hysteresis comparators with selectable threshold based
on the following scheme:
If DTEMP ≥ DTEMP_WR_TH occurs for an interval longer than T_otm_wr_flt filtering time, the OTM_WR flag is
set. The error flag remains set until the failure condition is removed.
If DTEMP ≥ DTEMP_SD_TH (= 185deg.) occurs for an interval longer than T_otm_sd_flt filtering time, the
OTM_SD flag is set. The error flag remains set until the failure condition is removed and the flag is cleared by the
SPI command.
The thermal Warning threshold can be configured by the following SPI bit sets:
Table 100. Thermal warning configuration bits
TWN_CFG1
TWN_CFG0
Description
0
0
130 deg.
L9908
Temperature Monitor (OTM)
DS13546 - Rev 3
page 103/153



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