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MC20XS4200 Datasheet(PDF) 32 Page - NXP Semiconductors |
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MC20XS4200 Datasheet(HTML) 32 Page - NXP Semiconductors |
32 / 71 page NXP Semiconductors 32 20XS4200 6.1.3.5 Going from Normal to Fail-safe, Fault or Sleep mode The device changes from Normal to Fail-safe (Fail-safe mode), Sleep mode (Sleep mode), or Fault mode (Fault mode), according to the value of the following signals (see Table 6). • wake-up = RSTB or IN_ON[0] or IN_ON[1] • fail-safe = (VDD Failure and VDD_FAIL_en) or (SPI watchdog timeout (tWDTO) and WD_dis = 0) • fault = OC[0:1] or OT[0:1] or SC[0:1] or UV or (OV and OV_dis) It enters Fail-safe mode in case of a timeout on SPI communication or when VDD is lost after having been initially present (if this function was previously enabled by setting: VDD_FAIL_EN bit = [1]). Setting watchdog disabled (WD_dis = 1, D4 of the GCR register) avoids entering Fail-safe mode after watchdog timeout. Device behavior upon fault occurrence is explained in the paragraph on Faults (Fault mode). Figure 12. Device operating modes 6.1.4 Sleep mode In Sleep mode, the channels and the SPI interface are turned off to minimize current consumption. The device enters Sleep mode (wake-up = 0) when both Direct Input pins IN(x) remain Off longer than tIN sec. (when reset is active; RSTB = 0). This is expressed as follows: Table 6. Device operating modes Mode Wake-up Fail-safe Fault Comments Sleep 0 x x All channels are OFF. Normal 1 0 0 The SPI Watchdog is active when: VDD = 5.0 V, WD_dis = 0, RSTB =1 Fail-safe 1 1 0 The channels are controlled by the IN inputs. (see Fail-safe mode) Fault 1 X 1 The channels are OFF, see Fault mode. x = Don’t care. Sleep (fail-safe = 0) and (wake-up = 1) and (fault = 0) (wake-up = 0) Fail-safe Normal (wake-up = 0) (fail-safe = 1) and (wake-up = 1) and (fault = 0) (fail-safe = 0) and (wake-up = 1) and (fault = 0) (wake-up = 1) and (fail-safe = 1) and (fault = 0) Fault (wake-up = 0) (wake-up = 1) and (fault = 1) (fail-safe = 0) and (wake-up = 1) and (fault = 1) (fail-safe = 1) and (wake-up = 1) and (fault = 1) (fail-safe = 0) and (wake- up = 1) and (fault = 0) (fail safe = 1) and (wake-up = 1) and (fault = 0) |
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