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DA6021 Datasheet(PDF) 178 Page - Renesas Technology Corp

Part # DA6021
Description  HIGHLY INTEGRATED POWER MANAGEMENT IC FOR INTEL® ATOM™ Z3000 PROCESSOR
PDF  225 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

DA6021 Datasheet(HTML) 178 Page - Renesas Technology Corp

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DA6021
HIGHLY INTEGRATED POWER MANAGEMENT IC FOR
INTEL® ATOM™ Z3000 PROCESSOR
Company Confidential
Data Sheet
Version 3.A - Final
31-Jan-14
© 2014 Dialog Semiconductor GmbH
178 of 224
www.dialog-semiconductor.com
Backup Battery Charger
16.5.1
The Backup Battery Charger is used to charge coin cell Li-
Ion batteries or “Super-capacitors”. Due to the
chemistry and/or relatively high internal resistance of these batteries it is necessary to charge in two stages: a
constant current stage; and a constant voltage stage. In essence this means that the charger acts as a current-
limited voltage source. The target voltage and maximum charge current are configurable via separate 2-bit
register settings.
In addition to battery charging the circuit must protect against discharging of the backup battery in cases when
the system supply drops below the backup battery voltage. For this reason an always-on protection circuit is
utilized which shuts off the reverse current path as required.
To facilitate low power system modes wherein no oscillator is running, the Backup Battery Charger is capable of
autonomously self-regulating its state such as to stop charging when the battery is full and to start once again
when the battery is sufficiently emptied.
Register Name
BBCHR_CFG
Address
0x2A
Page 1
Read/Write
Reset Value 0x1F
MSB
LSB
R
R
R
R/W
R/W
R/W
R/W
R/W
reserved
CHG_
DONE_ST
CHG_ST
CHGI
CHGV
CHGEN
CHGEN
0
1
Disable charging of back-up battery
Enable charging of back-up battery
CHGV
00
01
10
11
Back-up supply charging
2.5V
2.8V
3.0V
3.3V
CHGI
00
01
10
11
Current limit of back-up charger
10µA
50µA
100µA
500µA
CHG_ST
0
1
Not charging
Charging ongoing
CHG_DONE_ST
0
1
Not fully charged
Back-up charging completed
Power Consumption
16.5.2
The DA6021 logic supplied by the RTC domain will consume <5µA.



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