Motorola W24 Manual De Usuario
Chapter 2: Hardware Interface Description
May 31, 2008
Module Hardware Description
15
illustrates the power-off timings when using the ON_N signal.
Figure 2-5: ON_N Power Off Timing
Note:
If the unit was powered up by IGN, and it's being turned off by ON_N, the unit will enter
"Off mode", and not power off.
"Off mode", and not power off.
Turning the W24 Off Using IGN
The IGN signal may be used to power off W24 if the unit was powered-up by the IGN signal.
When the IGN signal is set low, W24 will turn off. This will initiate a normal power-off process,
which includes G24 power down (stacked configuration) and disabling of all applications
interfaces (UART, USB, etc.).
When the IGN signal is set low, W24 will turn off. This will initiate a normal power-off process,
which includes G24 power down (stacked configuration) and disabling of all applications
interfaces (UART, USB, etc.).
The IGN signal will not power off W24 before 30 seconds have elapsed since W24 was
powered-on. This delay mechanism is implemented to protect W24 from unexpected transients
on the IGN line during power up, particularly when applying vehicle cranking waveforms.
powered-on. This delay mechanism is implemented to protect W24 from unexpected transients
on the IGN line during power up, particularly when applying vehicle cranking waveforms.
illustrates the power-off timings when using the IGN signal.
Figure 2-6: IGN Power Off Timing