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BQ79600-Q1 Datasheet(PDF) 31 Page - Texas Instruments |
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BQ79600-Q1 Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 71 page  7.3.3.2 Fault Interface Host can acquire the fault status with the following two methods: • Host ignores NFAULT pin, constantly polls the FAULT_SUMMARY register of each device. If FAULT_SUMMARY is non-zero, read the low level fault status registers to obtain more information. • Host monitors NFAULT pin status. Enable fault status to pass down the daisy chain to bridge device. Enable bridge device’s NFAULT pin to be asserted when the FAULT_SUMMARY is non-zero. When NFAULT is triggered, host polls fault information to diagnose further. 7.3.3.2.1 NFAULT Device integrates an NMOS open-drain output (NFAULT) to signal the MCU that a fault has occurred in the system (either fault from BQ79600-Q1 or from monitoring IC). The NFAULT driver is enabled when [NFAULT_EN] = 1. When BQ79600-Q1 detects an unmasked fault, NFAULT asserts low. When NFAULT is disabled, the device will set the corresponding flag in FAULT_SUMMARY register but will not assert NFAULT. If the fault information of stack devices are not transmitted to bridge device through Section 7.3.3.2.2, NFAULT output only indicates faults in BQ79600-Q1. 7.3.3.2.2 Daisy Chain (COMH and COML) When using BQ79600-Q1 NFAULT pin to signal the host under a fault detection, the stack devices have to transfer their fault status information to the base device. The information is transmitted through COMH/L interface through the same communication cables: • In ACTIVE, BQ79600-Q1 detects embedded fault info in response frame from stack device. • In SLEEP, stack device sends Heartbeat and Fault tone to BQ79600-Q1. • In SHUTDOWN, use Sniff Detector of BQ79600-Q1 monitors stack device Fault tone. 7.3.3.2.2.1 Fault Transmitting when BQ79600-Q1 in ACTIVE In ACTIVE mode, stack devices can embed their fault status in their response frames (refer to Figure 7-7) that are sent to BQ79600-Q1. The BQ79600-Q1 can detect their embedded fault info and sets [FTONE_DET] bit once criteria in Figure 7-25 is met. Please refer to BQ7961X-Q1 on how to use embeded fault feature. To pass on the fault status of the stack devices, the host sends a stack read which will result with response frame pass through every device in the daisy chain, giving each device an opportunity to embed their fault status to response frame. INIT[7:0] Dev ADR[7:0] REG ADR[15:8] REG ADR[7:0] DATA MSB[7:0] CRC[7:0] +1 SYNC [1:0] SYNC = 2'b00 +1 SYNC [1:0] SYNC = 2'b00 +1 SYNC [1:0] SYNC = 2'b00 +1 SYNC [1:0] SYNC = 2'b00 SOF = 1 SOF bit of DEV ADR SOF bit of REG ADR[15:8] SOF bit of REG ADR[7:0] Fault Status 1 1 x 1 x 1 x 1 1 0 0 x 0 x 0 x 0 0 [FCOMM_EN] = '0' x x x [FCOMM_DET] = '0' [FCOMM_DET] = '1' [FCOMM_DET] = '0' [FCOMM_EN] = '1' Figure 7-25. Embed Fault Detection in Response Frame 7.3.3.2.2.2 Fault Transmitting when BQ79600-Q1 in SLEEP Because data communication is not available in SLEEP mode, the device provides following options to transmitting fault information: • Transmit the Heartbeat tone (enabled by [HB_TX_EN], used to check integrity of cable between bridge and first stack device). Device does not transmitted fault tone as it has NFAULT. www.ti.com BQ79600-Q1 SLUSDS1A – NOVEMBER 2019 – REVISED AUGUST 2020 Copyright © 2020 Texas Instruments Incorporated Submit Document Feedback 31 Product Folder Links: BQ79600-Q1 |
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