hardware design v1.00
Table Of Contents
- Contents
- Version History
- 1 Introduction
- 2 SIM968 Overview
- 3 Package Information
- 4 GSM Application Interface
- 4.1 GSM Power Supply
- 4.2 Power on/down Scenarios
- 4.3 Power Saving Mode
- 4.4 Charging Interface
- 4.5 RTC Backup
- 4.6 Serial Interfaces
- 4.7 Audio Interfaces
- 4.8 SIM Card Interface
- 4.9 LCD Display/SPI Interface
- 4.10 Keypad Interface
- 4.11 ADC
- 4.12 RI Behaviors
- 4.13 Network Status Indication
- 4.14 General Purpose Input/Output (GPIO)
- 4.15 External Reset
- 4.16 PWM
- 4.17 I2C Bus
- 4.18 GSM Antenna Interface
- 5 GNSS Application Interface
- 6 Electrical, Reliability and Radio Characteristics
- 6.1 Absolute Maximum Ratings
- 6.2 Recommended Operating Conditions
- 6.3 Digital Interface Characteristics
- 6.4 SIM Card Interface Characteristics
- 6.5 VDD_EXT Characteristics
- 6.6 SIM_VDD Characteristics
- 6.7 VRTC Characteristics
- 6.8 Current Consumption (VBAT = 3.8V)
- 6.9 Electro-Static Discharge
- 6.10 Radio Characteristics
- 6.11 Module label information
- Appendix
Smart Machine Smart Decision
Mode GPS_VCC V_BACKUP Internal LDO Main clock RTC clock
Full on on On on on on
Sleep on On on off on
Backup on On off off on
5.1.5.1 Full on Mode
The module will enter full on mode after first power up with factory configuration settings. Power consumption
will vary depending on the amount of satellite acquisitions and number of satellites in track. This mode is also
referenced as Full on, Full Power or Navigation mode.
Navigation is available and any configuration settings are valid as long as the GPS_VCC power supply is active.
When the power supply is off, settings are reset to factory configuration and receiver performs a cold start on next
power up.
5.1.5.2 Sleep Mode
Sleep mode means a low quiescent (440uA type.) power state, non-volatile RTC, and backup RAM block is
powered on. Other internal blocks like digital baseband and RF are internally powered off. The power supply
input GPS_VCC shall be kept active all the time, even during sleep mode.
Entering into sleep mode is sent PMTK command through the communication interface by host side.
The GNSS engine can be waked up from sleep mode by sent any byte through the communication interface.
5.1.6 GPS_VANT_OUT and GPS_VANT_IN
GPS_VANT_OUT is a 2.8V output for active external antenna, if the active external antenna works at 2.8V
voltage supply domain, user can connect the GPS_VANT_OUT and GPS_VANT_IN through a resistor (for
example 10ohm) in the following picture. If the antenna’s power is not 2.8V, a proper voltage should be provided
to the pin GPS_VANT_IN through a resistor (for example 10ohm) and the pin GPS_VANT_OUT should be kept
open in the following picture.
For passive antennas, both the pin GPS_VANT_OUT and the pin GPS_VANT_IN should be kept open.
SIM968_Hardware Design_V1.00 2013.02.25
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