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PMU_SHUTDOWN
This pin has the highest priority compared to other chip functionalities, therefore asserting it will always
force a hard reset
3.4.1.1 External circuitry on PMU_SHUTDOWN
There are three use cases for PMU_SHUTDOWN pin connection:
1. Controlled by external host.
2. Controlled by mechanical switch.
3. Not used.
3.4.1.2 PMU_SHUTDOWN connected to external host
In this use case it is the responsibility of the host to drive this pin with proper voltage at all times (1.8V/0V).
In case of internal pull at the host IO, it is recommended to disable it when driving this pin to GND.
LTE CAT-M1/NB1 ALT1250 Based Chipset Power
Altair Semiconductor Proprietary and Confidential 45
3.4.1.3 PMU_SHUTDOWN connected to mechanical switch
In this case, when button is not pushed, the pin can be pulled up either by external 1.8V source or by
PMU_VRTC.
If current during the time when button is pushed is a concern then some pullup disconnection circuitry
should be externally triggered when PMU_SHUTDOWN pin is being directed to GND
3.4.1.4 PMU_SHUTDOWN is not used
In this case PMU_SHUTDOWN pin should be tied directly to PMU_VRTC
This pin requires an external PU resistor, please see Table 5 more information.
The host connected to this pin should always keep the state of this pin (high/low) at a known state
(not floating) according to the required functionality.
PMU_POWER_BUTTON
This pin requires an external PU resistor, please see Table 5 more information.
The host connected to this pin should always keep the state of this pin (high/low) at a known state
(not floating) according to the required functionality.
PMU_WAKEUP
This pin wakes-up the system from low power state.
4 SIM Interface
Since all digital IOs in Type1SC are in 1.8V domain, the module will support 1.8V SIM cards (Class-C).
For 3.0V SIM card support, an external voltage translator will be required.
5 Host Interface
Type1SC uses the following signals for the host interface. The UART interface is necessary for
communication between the host and Type1SC.
The device reset status signal can be used by the host to detect that the modem has completed
a reset so that the host can properly reset its internal state.