hardware design v1 00 2
Table Of Contents
- Contents
- Version History
- 1 Introduction
- 2 SIM900R Overview
- 3 Package Information
- 4 Application Interface
- 4.1 Power Supply
- 4.2 Power on/down Scenarios
- 4.3 Power Saving Mode
- 4.4 RTC Backup
- 4.5 Serial Interfaces
- 4.6 Audio Interfaces
- 4.7 SIM Card Interface
- 4.8 LCD Display/SPI Interface
- 4.9 Keypad Interface
- 4.10 ADC
- 4.11 RI Behaviours
- 4.12 Network Status Indication
- 4.13 General Purpose Input/Output (GPIO)
- 4.14 External Reset
- 4.15 PWM
- 4.16 I2C Bus
- 4.17 Antenna Interface
- 5 Electrical, Reliability and Radio Characteristics
- 5.1 Absolute Maximum Ratings
- 5.2 Recommended Operating Conditions
- 5.3 Digital Interface Characteristics
- 5.4 SIM Card Interface Characteristics
- 5.5 VDD_EXT Characteristics
- 5.6 SIM_VDD Characteristics
- 5.7 VRTC Characteristics
- 5.8 Current Consumption (VBAT = 3.8V)
- 5.9 Electro-Static Discharge
- 5.10 Radio Characteristics
- 6 Manufacturing
- Appendix
Smart Machine Smart Decision
SIM900R_Hardware Design_V1.00 40 2012-07-20
PCL=19 130
PCL=0 300
PCL=7 155
DCS 1800
PCL=15 122
mA
I
VBAT-peak
Peak current During Tx burst 2 A
* In above table the current consumption value is the typical one of the module tested in laboratory. In the mass production stage,
there may be differences among each individual.
5.9 Electro-Static Discharge
SIM900R is an ESD sensitive component, so more attention should be paid to the procedure of handling and
packaging. The ESD test results are shown in the following table.
Table
23: The ESD characteristics (Temperature: 25 , Humidity℃ : 45 %)
Pin Contact discharge Air discharge
VBAT ±5KV ±10KV
GND ±4KV ±10KV
RXD, TXD ±3KV ±6KV
Antenna port ±5KV ±10KV
SPK_P/ SPK_N
MIC_P/ MIC_N
±2KV ±6KV
PWRKEY ±1KV ±6KV
5.10 Radio Characteristics
5.10.1 Module RF Output Power
The following table shows the module conducted output power, it is followed by the 3GPP TS 05.05 technical
specification requirement.
Table 24: SIM900R EGSM 900 conducted RF output power
EGSM 900
Tolerance (dB) for conditions
PCL Nominal output power (dBm)
Normal Extreme
0-2 39 ±2 ±2.5
3 37 ±3 ±4
4 35 ±3 ±4
5 33 ±3 ±4
6 31 ±3 ±4
7 29 ±3 ±4