Specifications

WM_PRJ_Q2501_PTS_001 – 003
March 2004
© 2003 All rights reserved
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Pin # Multiplex 1 Multiplex 2 Reset State Comments
69 BUZ Open collector
70 SIM_PRES Input
71 GSM_DCD1 Input
72 FLASH_LED Input
73 GPIO4 Input
74 GSM_RI1 Input
75 VBATT Input
76 VCC_RTC Input
77 VBATT Input
78 VBATT Input
79 VBATT Input
80 VBATT Input
2.5 Common GSM/GPS interface
2.5.1 Power supply
2.5.1.1 Main power supply
WISMO Quik Q2501 is powered by a single power supply signal VBATT, for
both GSM and GPS functions.
Pin description
Signal Pin # I/O I/O type Description
VBATT 75
77
78
79
80
I Supply Main power supply
The power supply constraints for GPS are not critical compared to GSM/GPRS.
Actually, the power supply is one of the key issues in the design of a GSM/GPRS
application. Due to the bursted nature transmission, the power supply must be
able to deliver high current peaks in a short time.
The GSM RF Power Amplifier current flows with a ratio of:
 Max current 1/8 of the time (around 577 µs every 4.615 ms for
GSM/GPRS class 2 – 2 RX / 1 TX),
 Max current 2/8 of the time (around 1154 µs every 4.615 ms for
GSM/GPRS class 10 – 3 RX / 2 TX).