参数资料
型号: 20-101-1215
厂商: Rabbit Semiconductor
文件页数: 26/130页
文件大小: 0K
描述: MCU RCM4050 RABBITCORE
标准包装: 1
系列: RabbitCore®
模块/板类型: MPU 核心模块
适用于相关产品: RCM4050
产品目录页面: 619 (CN2011-ZH PDF)
其它名称: 316-1145
User’s Manual
115
APPENDIX C. POWER SUPPLY
Appendix C provides information on the current requirements of
the RCM4000, and includes some background on the chip select
circuit used in power management.
C.1 Power Supplies
The RCM4000 requires a regulated 3.0 V – 3.6 V DC power source. The RabbitCore
design presumes that the voltage regulator is on the user board, and that the power is made
available to the RCM4000 board through header J2.
An RCM4000 with no loading at the outputs operating at 58.98 MHz typically draws
110 mA.
C.1.1 Battery Backup
The RCM4000 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 4000 real-time clock running.
Header J2, shown in Figure C-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 4000 real-time clock to retain data with the RCM4000 powered down.
Figure C-1. External Battery Connections
at Header J2
A lithium battery with a nominal voltage of 3 Vand a minimum capacity of 165 mAh is
recommended. A lithium battery is strongly recommended because of its nearly constant
nominal voltage over most of its life. A minimum battery voltage of 2.5 V is required for
proper operation.
1
8
2
7
VBAT_EXT
GND
External
Battery
J2
+3.3 V_IN
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