ZAMC4100GA2R datasheet(43/156 Pages) RENESAS

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ZAMC4100 Datasheet

January 26, 2016

3.5.

ZAMC4100 System Operational Modes

The ZAMC4100 supports three operational modes: NORMAL, SLEEP, and STANDBY. The transition between

the different operational modes is shown in Figure 3.6.

Figure 3.6 ZAMC4100 Operational Modes

Power-down

Reset

NORMAL

SUPPLY

STB

Y =

N x WDT

MCU reset

PASS

FAIL

SLEEP = 1

WAKE-UP

SLEEP

STANDBY

WAKE-UP

MCU supply

check

After power-on-reset, the SBC performs an MCU supply check ensuring that both MCU voltages (BUF1V8 and

REG3V3 – see section 2.1) are present and in range. Once the supply check has passed, the SBC enters

NORMAL Mode; otherwise it enters SLEEP Mode and no further operation is allowed. In this way, it assures the

correct functionally of the system in the event of unexpected faults.

3.5.1.

NORMAL Mode

In NORMAL Mode, the system is fully functional waiting to receive LIN commands and controlling the drivers.

From this mode, the system can branch in three directions:

•

Power-save in SLEEP Mode (see section 3.5.2)

•

Suspended MCU in STANDBY Mode (see section 3.5.3)

•

WDT reset event, where software fails to clear the WDT’s flag within the appropriate timing (see section

3.3.1)

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