Ebyte E30-TTL-100, Руководство пользователя

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SI4438 Wireless Module User Manual of E30 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd. 5 / 17
2.2 Parameters Notes

When designing current supply circuit, 30% margin is recommended to be remained so as to ensure long-term stable operation of
the whole module.

The current at the instant of transmitting may be high, but the total energy consumed may be lower due to very short transmitting
time.

When using external antenna, the impedance matching degree at different frequency points between antenna and module may
affect the transmitting current at different levels.

The current consumed when the RF chip is only working at receiving mode is called as receiving current. The tested receiving
current may be higher for some RF chips with communication protocol or when the developers have loaded their own protocol to
the whole module.

The current at pure receiving mode is at mA level. To achieve µA level receiving current, the users need to manage it through
firmware development.

The receiving sensitivity is tested at the speed rate of 1kbps.

The turn-off current is always lower than the current consumed when the power supply source of the whole module is at no-load
status.

Each LRC component has ±0.1% error, and the error will accumulate since multiple LRC components are used in the whole RF
circuit, and the transmitting current will be different at different modules.

The power consumption can be lowered by lowering the transmitting power, but the efficiency of the internal PA will be decreased
by lowering transmitting power due to various reasons.
3. Mechanical Characteristics
3.1 E30-TTL-100
3.1.1 Dimension