em3027 EM Microelectronic, em3027 Datasheet - Page 19

• Manufacturer Part Number: em3027
• Description: Real-time Clock With I2c Or Spi Interface, Crystal Temperature Compensation, Battery Switchover And Trickle Charger
• Manufacturer: EM Microelectronic

V
V
9.1
The device can be supplied from the V
compares V
Nevertheless, the communication pins (SCL, SDA or CS, SCK, SI, SO) are supplied from the V
when serial interface (I2C or SPI) is used, the whole chip has to be supplied from V
The serial data communication can be performed if V
Copyright © 2008, EM Microelectronic-Marin SA
07/08 – rev B
CC
Back
9
Power Management
Power Supplies, Switchover and Trickle Charge
Switchover
CC
R
and V
R80K
Back
voltages and connects the higher of them to the internal V
R20K
Trickle Charger
R5K
CC
Figure 7 – Operating voltage functions
pin or from the V
R1.5K
Figure 6 – Power management
CC
> V
V
Figure 5
High
Back,
Enable
(1 or 16 seconds)
regulator
Voltage
Back
in this condition the input and output pins are enabled.
19
pin. The switchover block implemented inside the chip
Voltage
monitoring
Internal voltage
CC
. (i.e. V
Vlow2
Vlow1
High
CC >
level that supplies the chip.
CC
V
Back
pin only. For that reason,
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V
).
REG
EM3027