Telit Wireless Solutions LE915A P Series, Руководство по конструкции аппаратуры

Страница: 16 / 51

LE915Ax-P
Hardware Design Guide
1VV0301680 Rev. 2
Page 16 of 51 2021-10-04
Not Subject to NDA
4. POWER SUPPLY
The power supply circuitry and the board layout are a very important part in the full
product design and they strongly reflect on the product overall performances, so the
requirements and the guidelines that will follow should be read carefully for a proper
design.
Main Power Supply Requirements
The external power supply must be connected to VBAT1 and VBAT2 pads and must fulfil
the following requirements:
Power Supply Value
Recommended Nominal Supply Voltage 3.8V
Operating Voltage Range 3.3 V - 4.4 V
Maximum ripple on module input supply 30mV
Table 9 : Power Supply Requirements
The minimum operating voltage acceptable for LE915Ax-P is 3,3 V. Special care must be
taken to prevent voltage drops below 3.3V
even when transmission starts from idle state.
It is highly recommended to apply a voltage monitoring circuit in the application board to
ensure that the supply voltage is suitable for stable operating.
Note: The power supply should be dimensioned for at least 2.0A at
nominal power supply voltage.
Power Consumption (Typical)
Table 10: Power consumption
Test condition LE915A6-P (mA) LE914-P (mA)
Off current 0.7 0.6
Idle current (128 cycle) 427 346
Idle current (256 cycle) 427 346
LTE (TX = 0dBm) 1050 670
LTE (TX = 23dBm) 1410 1010