SIM800C datasheet(17/52 Pages) SIMCOM

17 / 52 page

Smart Machine Smart Decision

SIM800C_Hardware_Design_V1.02

2015-4-27

4. Application Interface

4.1. Power Supply

The power supply range of SIM800C is from 3.4V to 4.4V. Recommended voltage is 4.0V. The transmitting

burst will cause voltage drop and the power supply must be able to provide sufficient current up to 2A. For the

VBAT input, a bypass capacitor (low ESR) such as a 100 µF is strongly recommended.

For the VBAT input, a 100uF Tantalum capacitor (CA low ESR) and a 1uF~10uF Ceramics capacitor CB are

strongly recommended. Increase the 33pF and 10pF capacitors can effectively eliminate the high frequency

interference. A 5.1V/500mW Zener diode is strongly recommended, the diode can prevent chip from damaging

by the voltage surge. These capacitors and Zener diode should be placed as close as possible to SIM800C

VBAT pins.

V BAT

5.1V

500m W

C A

C B

33pF 10pF

Figure 5: Reference circuit of the VBAT input

Table 6: Recommended zener diode

Vendor

Part number

Power(watts)

Packages

On semi

MMSZ5231BT1G

500mW

SOD123

Prisemi

PZ3D4V2H

500mW

SOD323

Vishay

MMSZ4689-V

500mW

SOD123

Crownpo

CDZ55C5V1SM

500mW

0805

The following figure is the reference design of +5V input power supply. The output power supply is 4.1V, thus a

linear regulator can be used.

Vin

Vout

P W R _CT RL

R 102

R 101

VBAT

100K

43K

+ C103

330uF

C104

100nF

U101 M IC 29302

C101

C102

100uF

1uF

DC IN P U T

R103

470Ω

O n/O ff

Figure 6: Reference circuit of the LDO power supply

If there is a high drop-out between the input and the desired output (VBAT), a DC-DC power supply will be

preferable because of its better efficiency especially with the 2A peak current in burst mode of the module. The

SIM800C 数据表(PDF) 17 Page - SIMCom

SIM800C 数据表(HTML) 17 Page - SIMCom

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

数据表下载

链接网址

SIM800C 数据表(PDF) 17 Page - SIMCom

SIM800C 数据表(HTML) 17 Page - SIMCom

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52

数据表 下载

链接网址

数据表下载