ZAMC4100 Datasheet, PDF (43/155 Pages) Integrated Device Technology – Actuator and Motor Controller

ZAMC4100 Datasheet
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
SUPPLY
Power-down
Reset
N x WDT
MCU reset
MCU supply
check
FAIL
PASS
NORMAL
SLEEP = 1
STBY _{= 1}
SLEEP
WAKE-UP
STANDBY
WAKE-UP
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)
© 2016 Integrated Device Technology, Inc.
43
January 26, 2016