UC864-E Hardware User Guide
1vv0300766a Rev.1 - 31/01/08
5 Power Supply
The power supply circuitry and board layout are a very important part in the full product design and they strongly reflect on the product overall performances, hence read carefully the requirements and the guidelines that will follow for a proper design.
5.1Power Supply Requirements
POWER SUPPLY
Nominal Supply Voltage
Max Supply Voltage
Supply Voltage Range
3.8V
4.2
3.51 – 4.2
The
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| Average (mA) |
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| Mode description | |
| IDLE mode |
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| Stand by mode; no call in progress |
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| AT+CFUN=1 |
| 21,7 |
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| Normal mode: full functionality of the module (MF=9) |
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| AT+CFUN=4 |
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| 21,3 |
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| Disabled TX and RX; module is not registered on the | |
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| Power saving: CFUN=0 module registered on the network | |
| AT+CFUN=0 or |
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| and can receive voice call or an SMS; but it is not possible | |
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| 3,3 |
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| to send AT commands; module wakes up with an | ||
| AT+CFUN=5 |
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| unsolicited code (call or SMS) or rising RTS line. CFUN=5 | ||
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| full functionality with power saving; module registered on | |
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| the network can receive incoming calls and SMS – (MF=2) | |
| GSM TX | and RX mode |
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| Min power level |
| 139.1 |
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| GSM Sending data mode |
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| Max power level |
| 340.8 |
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| GPRS (class | 10) TX and RX mode |
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| GPRS Sending data mode (3 slot TX) |
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| Max power level |
| 728.2 |
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| WCDMA |
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| WCDMA Call in progress |
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| Max power level |
| 619,7 |
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In GSM/GPRS mode, RF transmission is not continuous and it is packed into bursts at a base frequency of about 216 Hz, and the relative current peaks can be as high as about 2A. Therefore the power supply has to be designed in order to withstand with these current peaks without big voltage drops; this means that both the electrical design and the board layout must be designed for this current flow.
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