Users Manual

TPM541 series
www.sercomm.com 7
Cat-M1/NB Module
5. LED status
5.1. Module_PWR1 LED:
For VCC status indication.
 ON: VCC is present.
 OFF: VCC is absent.
 VCC is provided by 5V to 3.3V LDO.
5.2. Module_LED1:
This LED is controlled by PMU_EXT_ALARM pin, it can be used for alarming an external host.
Output
Conditions
High
Active , LS, DS
Low
DH0, DH1 and DH2
5.3. Module_LED2:
Reserved