User's Manual
Table Of Contents
- Contact Information
- Revision History
- 1 Product Features
- 2 Pin Definitions
- 3 Electrical Specifications
- 4 Mechanical Information
- 5 Packing Information
- 6 PCB Mounting Guidelines
- 7 Regulatory and Industry Approval
- Initialisms
Product datasheet
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3.2 Control Interfaces
This section describes the power-on/off, wake-up, and reset interface for controlling
the module.
3.2.1 Power-on Signal (TBD)
The POWER_ON signal is an active low input signal used to enable or disable the
module. Do not toggle the PERST# pin during power-on. This signal has the highest
priority among the wakeup, the alarm signal, and the digital control pins.
There are three possible states of the module:
• Module Off: V
CC
is not present.
• Module Enabled: V
CC
is supplied, and the module is enabled.
• Module Disabled: V
CC
is supplied, and the module is disabled.
The state transitions are defined as follows:
• When voltage is applied to V
CC
, the module shall enter the Module Disabled
state.
An input to the POWER_ON pin shall trigger the transition from the Module Disabled
to the Module Enabled state. See Figure 6; a low pulse (tlow > 0s) on the POWER_ON
pad will enable the module after V
CC
is applied.
3.2.2 Wake-up Interface (TBD)
In applications where power consumption is a major factor in performance metrics
(such as battery-operated sensors that are based on an IOT/M2M modem solution
and also include a third-party host), definitions are necessary for a simple interface
that will enable both the modem and the host to enter low-power states whenever
possible and the other side to wake it up once required.
For example, if the host has no data to transmit or any other tasks, it may enter a
low-power state according to its own capabilities and configurations. If during that
period the host is in a low-power state and the modem suddenly receives data, it
must wake-up the host.
A similar requirement exists in the reverse case. For example, if the modem is in a
low-power state and suddenly the host must transmit data, it must be able to wake-
up the modem.
The interface consists of two signals: One is triggered by the host and received by
the modem; the other is triggered by the modem and received by the host.
Each side can wake the other by toggling a wakeup signal high and enabling the