MC20XS4200 datasheet(32/71 Pages) NXP

Part #	MC20XS4200

Description	Dual 24 V, 20 mOhm high-side switch

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Manufacturer	NXP [NXP Semiconductors]

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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

All channels are OFF.

Normal

1

0

The SPI Watchdog is active when: VDD = 5.0 V,

WD_dis = 0,

RSTB =1

Fail-safe

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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