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MFS2301BMBACEP Datasheet(PDF) 83 Page - NXP Semiconductors |
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MFS2301BMBACEP Datasheet(HTML) 83 Page - NXP Semiconductors |
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83 / 230 page  NXP Semiconductors FS23 Safety system basis chip (SBC) with power management, CAN FD and LIN transceivers 19.2.6 Watchdog electrical characteristics TA = −40 °C to 125 °C, unless otherwise specified. VSUP = 5.5 V to 40 V, unless otherwise specified. All voltages referenced to ground. Symbol Parameter Min Typ Max Unit Watchdog WDPER_ACC Watchdog period accuracy -10 - 10 % WDDUTY_CYCLE Window watchdog duty cycle 47.5 50 52.5 % Table 41. Watchdog electrical characteristics 19.3 FCCU monitoring The FS23 provides an FCCU monitoring feature, which is a hardware monitoring mechanism of the MCU failure. This feature is enabled by OTP using FCCU_EN_OTP bit. The FCCU input pins of the FS23 are in charge of monitoring the error signals of the MCU fault collection and control unit. The FS23 provides one dedicated FCCU1 pin. Another input among HVIO1, HVIO2, LVIO3, LVIO4, and LVI5 can be configured as FCCU2 pin, via FCCU2_ASSIGN[2:0] bits, in INIT phase. The FCCU input pins can be configured by pair, or single independent inputs using FCCU_CFG[2:0] bits. The FCCU monitoring is active as soon as the INIT phase is closed. It is deactivated when the device goes to LPON or LPOFF modes. FCCU_CFG[2:0] FCCU pins configuration 000 No monitoring 001 (default) FCCU1 and FCCU2 inputs monitoring activated by pair (bi-stable protocol) 010 FCCU1 or FCCU2 single input level monitoring activated 011 FCCU1 input level monitoring only, FCCU2 input not used 100 FCCU2 input level monitoring only, FCCU1 input not used 101 FCCU1 or FCCU2 single input PWM monitoring activated 110 FCCU1 input PWM monitoring only, FCCU2 input level monitoring 111 FCCU2 input PWM monitoring only, FCCU1 input level monitoring Reset condition POR Table 42. FCCU monitoring configuration 19.3.1 FCCU12 monitoring by pair When FCCU12 are used by pair, the bi-stable protocol is supported according to Figure 48: aaa-051469 MCU operating phase FCCU1 Reset Normal Configuration Error FCCU2 Figure 48. FCCU bi-stable protocol FS23 All information provided in this document is subject to legal disclaimers. © 2024 NXP B.V. All rights reserved. Product data sheet Rev. 7.0 — 16 October 2024 Document feedback 83 / 230 |
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