参数资料
型号: 101-1226
厂商: Rabbit Semiconductor
文件页数: 70/168页
文件大小: 0K
描述: RCM3900 DEV KIT UNIVERSAL
标准包装: 1
系列: RabbitCore 3900
类型: MPU 模块
适用于相关产品: RCM3900
所含物品: RabbitCore 模块、开发板、交流适配器、缆线和 Dynamic C? 光盘
其它名称: 316-1137
RabbitCore RCM3900 User’s Manual
161
APPENDIX D. POWER SUPPLY
Appendix D provides information on the current requirements
of the RCM3900, and includes some background on the chip
select circuit used in power management.
D.1 Power Supplies
Power is supplied from the motherboard to which the RCM3900 is connected via header
J62. The RCM3900 requires a regulated 3.15 V to 3.45 V DC power source. An RCM3900
with no loading at the outputs operating at 44.2 MHz typically draws 350 mA.
D.1.1 Battery Backup
The RCM3900 does not have a battery, but there is provision for a customer-supplied bat-
tery to back up the data SRAM and keep the internal Rabbit 3000 real-time clock running.
Header J62, shown in Figure D-1, allows access to the external battery. This header makes
it possible to connect an external 3 V power supply. This allows the SRAM and the inter-
nal Rabbit 3000 real-time clock to retain data with the RCM3900 powered down.
Figure D-1. External Battery Connections
at Header J62
VRAM
+3.3 VIN
30
31
29
32
VBAT_EXT
GND
External
Battery
J62
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