AT91CAP9A-STK Atmel, AT91CAP9A-STK Datasheet - Page 32

• Manufacturer Part Number: AT91CAP9A-STK
• Description: KIT STARTER FOR AT91CAP9A
• Manufacturer: Atmel
• Series: CAP™r
• Type: MCUr

Specifications of AT91CAP9A-STK

• Contents: Board, CD
• For Use With/related Products: AT91CAP9
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.4.1.11 F11: Battery Charger
2.4.1.12 F12: RTC and Backup
2.4.1.12.1Backup
2.4.1.12.2RTC
AT91CAP9-STK Starter Kit User Guide
CHARGER_IRQ
An Atmel AT73C205 stand alone battery charger is implemented on the board.
It manages the charge of an external Li-Ion battery plugs on the EI1 interface, from 5V AC/DC sector
adapter or VBUS USB Device external power source.
The battery charger is controlled by the AT91CAP9 TWI bus.
Two LEDs (yellow and green) indicate the charge status.
The implementation of the AT73C205 battery charger is shown below.
The first AT73C224 PMC provides a 3V VBACKUP power supply on its VBK power pin, from non-man-
aged VIN_PMC supply on it's VDDRTC power in.
This VBACKUP power supply recharges a manganese-lithium rechargeable coin battery in the EI12
interface. It also supplies the AT73C239 chip on it's VBAT power pin, which generates (VO4 output)
1.2V_SAVE to supply the VDDBU AT91CAP9 power supply.
When no external power supplies are applied on the board, the AT73C239 is only supplied by the man-
ganese-lithium rechargeable coin battery to maintain the VDDBU AT91CAP9 power supply
The first AT73C224 PMC described above integrates an RTC module with an external 32,768 kHz
quartz connection.
The RTC module is powered by a non-managed VIN_PMC source on it's VDDRTC power pin. When no
external power supplies are applied on the board, the RTC module is powered on it's VBK power pin by
the manganese-lithium rechargeable coin battery, VBACKUP supply.
3V3
R3
10K
R2
1K
R1
1K
MAXS
TW D
TW CK
2
D1
YELLOW
10uF_1210
C7
2
1
(See “First AT73C224” on page
1
D2
GREEN
C282
10nF
2
1
BATTERY CHARGER
3V3
C8
1nF
11
12
13
14
15
16
8
6
7
U1
AT73C205
MAXS
LED1
LED2
EN
DIN/ISET1
DOUT/ISET2
SCLK/IUSBSET
CSB/BATTYPE
ITB
GNDPAD
ADCAUX
ACDC
BATS
GND
USB
BAT
TS
1
2
3
4
9
10
5
17
5VDC_SECTOR
BAT_TS
NC
2-23.)
R172
0R
TP1
R173
0R
10uF_1210
C2
100nF
C4
100nF
C9
C1
10uF_1210
C5
10uF_1210
5VDC_SECTOR
R174
0R
+
+
C3
10UF_16V
C6
10UF_16V
VBAT
6351B–CAP–27-Jun-08
VBUS
Requirements
1
2
3
HE14_3PTS
J4
2-25