General features

• Quad-Band GSM 850/900/18001900MHz
• GPRS multi-slot class 10
• GPRS mobile station class B
• Compliant to GSM phase 2/2+
  • Class 4 (2 W @ 850/900 MHz)
  • Class 1 (1 W @ 1800/1900MHz)
• Control via AT commands (3GPP TS 27.007 and SIMCom enhanced AT Commands)
• SIM application toolkit
• Supply voltage range:
  • GPRS: 3.2 ~ 4.8 V
  • V-GPS: 2.8 ~ 4.3V
  • VCHG: 5V
• Low power consumption
• Dimensions: 30*30*3.0mm
• Weight: 5.3g

Specifications for SMS via GSM / GPRS

• Point-to-point MO and MT
• SMS cell broadcast
• Text and PDU mode

Specifications for audio

• Tricodec
  • Half rate (HR)
  • Full rate (FR)
  • Enhanced Full rate (EFR)
• Hands-free operation
• Echo cancellation

Specifications for data transfer

• GPRS class 8/10: max. 85.6 kbps (downlink)
• PBCCH support
• Coding schemes CS 1, 2, 3, 4
• PPP-stack
• Integrated TCP/IP stack

Specifications for CSD data

• CSD up to 14.4 kbps
• USSD
• Non transparent mode

Compatibility

• AT cellular command interface

Specification for GPS

• Support EASYTM self-generated orbit prediction
• Support EPOTM orbit prediction
• Support SBAS ranging (WAAS, EGNOS, GAGAN, MSAS)
• Support Jamming Removing
• Integrated Low-noise amplifier
• Receiver type - 33tracking/99 acquisition-channel GPS receiver
• Max. update rate: 10Hz
• Sensitivity1
  • Tracking: -167 dBm
  • Reacquisition: -157 dBm
  • Cold starts: -148 dBm
• Time-To-First-Fix1,2
  • Cold start: 28s
  • Warm start: 26s
  • Hot start:
  • EPO Assist: 13s（CTTFF)
• Accuracy
  • Automatic Position3:
  • Speed4: 0.1m/s

Interfaces

• 80-pad with SMT type
• one Interface for external SIM card :3V/ 1.8V
• two analog audio interfaces
• SPI interface
• RTC backup
• A serial interface and a debug interface for GSM/GPRS
• two serial interfaces for GPS
• charge input

Certifications 

• CE

Document

• SIM928A_Hardware Design_V1.00
• SIM928A_AT_Command_Manual_V1.00
• SIM928_A_968-EVBkit_UserGuide_V1.00