Q2686

Manufacturer Part NumberQ2686
DescriptionWireless CPU
ManufacturerWavecom
Q2686 datasheet
 
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Page 61/89

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3.19
BAT-RTC (Backup Battery)
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
www.DataSheet4U.com
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.
Signal
BAT-RTC
Output voltage
Output current
*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
®
provides an input/output to connect a Real Time
Q2686
2.5V
from VBATT
regulator
1.8V
to RTC
regulator
Figure 10: Real Time Clock power supply
Pin description
Pin number
I/O
I/O type
7
I/O
Supply
Electrical characteristics of the signals
Parameter
Minimum
Input voltage
1.85
Input current
consumption*
confidential ©
Q2686 Wireless CPU
Interfaces
®
when VBATT is available, but a
BAT-RTC (Pin 7)
Description
RTC Back-up supply
Typ
Maximum
Unit
2.5
V
3.3
μA
2.45
V
2
mA
®
power supply is off (VBATT = 0V).
®
Page: 60 / 87
March 6, 2007