Q2686 Wavecom, Q2686 Datasheet - Page 61

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Q2686

Manufacturer Part Number
Q2686
Description
Wireless CPU
Manufacturer
Wavecom
Datasheet

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3.19
The Q2686 Wireless CPU
Clock (RTC) power supply.
3.19.1 Interface Description
This pin is used as a back-up power supply for the internal Real Time Clock.
The RTC is supported by the Wireless CPU
back-up power supply is needed to save date and time when VBATT is
switched off (VBATT = 0V).
If the RTC is not used, this pin can be left open.
If VBATT is available, the back-up battery can be charged by the internal 2.5V
power supply regulator.
*Provided by an RTC back-up battery when Wireless CPU
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PRJ_Q2686_PTS_001-007
BAT-RTC
Signal
BAT-RTC (Backup Battery)
Output voltage
Output current
consumption*
Input voltage
Input current
Parameter
confidential ©
Pin number
Figure 10: Real Time Clock power supply
from VBATT
Q2686
Electrical characteristics of the signals
to RTC
7
®
provides an input/output to connect a Real Time
Minimum
Pin description
I/O
I/O
regulator
regulator
1.85
2.5V
1.8V
I/O type
Supply
2.45
Typ
3.3
®
®
when VBATT is available, but a
power supply is off (VBATT = 0V).
Maximum
RTC Back-up supply
BAT-RTC (Pin 7)
Q2686 Wireless CPU
2.5
2
Description
Unit
mA
μA
V
V
Interfaces
March 6, 2007
Page: 60 / 87
®

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