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L9908 データシート(PDF) 103 Page - STMicroelectronics |
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L9908 データシート(HTML) 103 Page - STMicroelectronics |
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103 / 152 page  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 Functional description DS13546 - Rev 5 page 103/152 |
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