收藏本站
C.2.1 Replacing the Backup Battery
The battery is user-replaceable, and is fitted in a battery holder. To replace the battery, lift
up on the spring clip and slide out the old battery. Use only a Panasonic CR2330 or equiv-
alent replacement battery, and insert it into the battery holder with the + side facing up.
NOTE: The SRAM contents and the real-time clock settings will be lost if the battery is
replaced with no power applied to the Smart Star. There is a provision for an external bat-
tery if you need to save the SRAM contents and the real-time clock settings since the CPU
Card needs to be removed from the backplane in order to change the onboard battery.
CAUTION: There is an explosion danger if the battery is short-circuited, recharged, or
replaced incorrectly. Replace the battery only with the same type or an equivalent type
recommended by the battery manufacturer. Dispose of used batteries according to the
battery manufacturer’s instructions.
C.2.2 Battery-Backup Circuit
Figure C-1 shows the battery-backup circuit.
Internal Battery
BT1
VBAT-INT
D3
R41
1 k W
R39
1 k W
VRAM
External Battery
T
RT1
thermistor
J8
1
2
VBAT-EXT
D5
R42
R1
22 k W
3
1 k W
22 k W
VBAT
D1
Vcc
D2
R3
10 k W
R6
22 k W
R8
47 k W
VOSC
C12
10 nF
C6
10 nF
Figure C-1. Smart Star CPU Card Backup Battery Circuit
The battery-backup circuit serves three purposes:
? It reduces the battery voltage to the SRAM and to the real-time clock, thereby limiting
the current consumed by the real-time clock and lengthening the battery life.
? It ensures that current can flow only out of the battery to prevent charging the battery.
? A voltage, VOSC, is supplied to U14, which keeps the 32.768 kHz oscillator working
when the voltage begins to drop.
VRAM and Vcc are nearly equal (<100 mV, typically 10 mV) when power is supplied to
the CPU Card.
User ’s Manual
167
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
101-0545 PROTOTYPING BOARD FOR LP3500
101-0563 RCM3400 PROTO BOARD
101-0589 CLONING BOARD RABBIT
101-0688 CARD D/A EXPANSION RN1300
101-0954 KIT DEV RABBIT RCM3360/3370 INTL
101-1050-BE-00025 ADPT USB 2 A FEMALE-2 5PIN .25M
10112627-101LF MINI-SAS HD 1X2 EXT PCB
10112628-101LF MINI-SAS HD 1X4 EXT PCB
相关代理商/技术参数
101-0507 功能描述:模块化系统 - SOM RCM3000 RABBITCORE RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
101-0508 功能描述:模块化系统 - SOM RCM3010 RABBITCORE RoHS:否 制造商:Digi International 外观尺寸:ConnectCore 9P 处理器类型:ARM926EJ-S 频率:150 MHz 存储容量:8 MB, 16 MB 存储类型:NOR Flash, SDRAM 接口类型:I2C, SPI, UART 工作电源电压:3.3 V 最大工作温度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
101050-9 制造商:RUKO 功能描述:Bulk 制造商:RUKO 功能描述:STEP DRILL 4-12MMX1MM 制造商:RUKO 功能描述:STEP DRILL, 4-12MMX1MM 制造商:RUKO 功能描述:STEP DRILL, 4-12MMX1MM; Drill Bit Size Metric:4mm; Overall Length:65mm; SVHC:No SVHC (19-Dec-2012); Drill Bit Type:Step; Drill Point Diameter:4mm; Material:HSS; Range:4mm - 12mm; Shank Dia:6mm; Step:1mm ;RoHS Compliant: NA
101050BO 制造商:TE Connectivity 功能描述:
101051 制造商:RUKO 功能描述:STEP DRILL 4-20MMX2MM 制造商:RUKO 功能描述:STEP DRILL, 4-20MMX2MM 制造商:RUKO 功能描述:STEP DRILL, 4-20MMX2MM; Drill Bit Size Metric:4mm; Overall Length:75mm; SVHC:No SVHC (19-Dec-2012); Drill Bit Type:Step; Drill Point Diameter:4mm; Material:HSS; Range:4mm - 20mm; Shank Dia:8mm; Step:2mm ;RoHS Compliant: NA
10-105108-03G 制造商:Amphenol Aerospace 功能描述:10-105108-03G
10-105108-03P 制造商:Amphenol Aerospace 功能描述:10-105108-03P
10-105108-04P 制造商:Amphenol Aerospace 功能描述:10-105108-04P