SI4438 Wireless Module
User Manual of E30 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd.
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1. Features
Ultra-low power consumption:
It supports WOR, which suits for battery power supply. In power-saving mode (Mode 2), the overall
power consumption can be regulated by setting receiving response delay and its maximum is 2000ms. The average current is about
30uA.
Fixed transmission:
Module can communicate with other modules which work in different channels and addresses. It makes
networking and repeater easy. For example: module A transmits AA BB CC to module B (address: 0x00 01, channel: 0x80). The HEX
format is 00 01 80 AA BB CC (00 01 refers to the address of module B, and 80 refers to the channel of module B). Then module B
receives AA BB CC (only module B).
Broadcast transmission:
When the module address is set as 0xFFFF, the module can communicate with other modules in the
same channel.
FEC:
Forward Error Correction has high coding efficiency & good correction performance. In case of sudden interference, it can
correct the interfered data packets proactively, so that the reliability & transmission range are improved correspondingly. Without
FEC, those data packets can only be dropped.
Sleep mode:
When the module works in sleep mode (Mode 3), it is available for configuration, but not for transmitting &
receiving. The typical current is 2.0uA in this mode.
Application:
Compared with 2.4G, it is better in penetration and diffraction but less in speed rate. It is applicable in the open air
and places with a few obstacles.
2. Technical Parameters
Model
IC
Size
Net weight
Operating
temperature
Operating
humidity
Storage
temperature
E30-TTL-100
SI4438
21 * 36 mm
6.7±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
E30-T100S2
SI4438
17 * 30 mm
2.3±0.1g
-40 ~ 85℃
10% ~ 90%
-40 ~ 125°C
2.1 E30-TTL-100/ E30-T100S2
Parameter
Min
Typ
Max
Unit
Transmitting current
82
89
98
mA
Receiving current
15
16
17
mA
Turn-off current
3
4
5
μA
Transmitting power
19.3
20
20.6
dBm
Receiving sensitivity
-120
-121
-122
dBm
Voltage supply
2.3
3.3
5.2
V
Communication level
2.5
3.3
3.6
V
