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HUAWEI EM820W HSPA+ PC Embedded Module
Hardware Guide
5.5 Power Supply Features
5.5.1 Power Supply
The EM820W receives its power supply from a 3.3 V power source, which must
satisfy all requirements of PCI Express Mini CEM specifications, such as voltage
tolerance and peak and normal current. The detailed requirements are listed in Table
5-3.
Table 5-3 Power requirements
Power
3.3 V
5.5.2 Power Consumption
The power consumptions of the EM820W in different scenarios are listed in Table 5-4,
Table 5-5 and Table 5-6 respectively.
Table 5-4 DC power consumption (HSPA/WCDMA)
Description
WCDMA
Issue 01 (2010-12-09)
P
I
indicates power pins;
AI
signal output;
indicates pins for analog signal input;
output.
Voltage Tolerance
±9%
In burst transmit mode of GSM/GPRS/EDGE, the instantaneous current of the module will
exceed 2.75 A, which will pull down the power voltage transitorily and perhaps result in the
reset of the module or host. In order to prevent this situation, you can add a large bulk
capacitor beside the module on the host side (at least two 330uF capacitors).
Band
Band I (IMT2100)
Band II
(PCS 1900)
Band V
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indicates pins for digital signal input;
Peak (Maximum)
2750 mA1
Test Value
284
336
544
289
340
606
293
Electrical and Reliability Features
O
indicates pins for digital
AO
indicates pins for analog signal
Normal (Maximum)
1100 mA
Units
Power (dBm)
mA
1 dBm Tx Power
10 dBm Tx Power
24 dBm Tx Power
mA
1 dBm Tx Power
10 dBm Tx Power
24 dBm Tx Power
mA
1 dBm Tx Power
30
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