Pin |
| Name |
| Direction |
| Function |
|
|
|
|
|
|
|
1 |
| VCC |
| Input |
| DC power |
3 |
| VCC |
| Input |
| DC power |
5 |
| VCC |
| Input |
| DC power |
7 |
| VCC |
| Input |
| DC power |
9 |
| VCC |
| Input |
| DC power |
Power is supplied to the wireless modem VCC pins, from an external source.
User application circuitry should connect all VCC pins together in to carry the current drawn by the wireless modem.
The electrical characteristics for VCC are shown in the following table.
|
| Parameter |
|
| Mode |
|
| Limit |
|
|
|
|
|
|
|
|
|
|
| VCC Supply voltage |
|
| Nominal |
|
| 3.6 V |
|
|
|
|
| Min |
|
| 3.2 V |
|
|
|
|
| Max |
|
| 4.5 V |
|
|
|
|
| Absolute maximum |
|
| |
|
|
|
|
| voltage range |
|
| |
|
|
|
|
|
|
|
| |
|
|
|
|
| Maximum supply ripple |
|
| <100mV @<200kHz |
|
|
|
|
|
|
| <20mV @>200kHz | |
|
|
|
|
|
|
|
| |
|
| Maximum allowable voltage drop |
| Transmission burst |
|
| 200mV | |
|
| Maximum current consumed |
|
| Full power (2W) transmit |
|
| 2050 mA peak |
|
|
|
| (single uplink slot) |
|
| 330mA average | |
|
|
|
|
|
|
| ||
!
WARNING
TIP
Stresses in excess of the absolute maximum limits can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.
The wireless modem has insufficient internal capacitance to supply the large current peaks during GSM burst transmission - use the following general guidelines in designing the application power supply.
•Fit a low ESR electrolytic capacitor close to the wireless modem (>1,000 ∝F, with an ESR < 100 mΩ)
•Ensure power supply to wireless modem line resistance is < 200 mΩ
LZT 123 1834 | 38 |