![background image](http://html1.mh-extra.com/html/rabbit/rabbitcore-rcm3305/rabbitcore-rcm3305_user-manual_3118743141.webp)
User’s Manual
135
A
PPENDIX
D. P
OWER
S
UPPLY
Appendix D provides information on the current requirements
of the RCM3305/RCM3315, and includes some background on
the reset generator.
D.1 Power Supplies
Power is supplied from the motherboard to which the RCM3305/RCM3315 is connected
via header J4. The RCM3305/RCM3315 requires a regulated 3.15 V to 3.45 V DC power
source. An RCM3305/RCM3315 with no loading at the outputs operating at 44.2 MHz
typically draws 350 mA.
D.1.1 Battery Backup
The RCM3305/RCM3315 does not have a battery, but there is provision for a customer-
supplied battery to back up the data SRAM and keep the internal Rabbit 3000 real-time
clock running.
Header J4, 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 RCM3305/RCM3315 powered
down.
Figure D-1. External Battery Connections
at Header J4
VRAM
+3.3 VIN
30
31
29
32
VBAT_EXT
GND
External
Battery
J4
Содержание RabbitCore RCM3305
Страница 6: ...RabbitCore RCM3305 RCM3315...
Страница 14: ...8 RabbitCore RCM3305 RCM3315...
Страница 22: ...16 RabbitCore RCM3305 RCM3315...
Страница 28: ...22 RabbitCore RCM3305 RCM3315...
Страница 70: ...64 RabbitCore RCM3305 RCM3315...
Страница 106: ...100 RabbitCore RCM3305 RCM3315...
Страница 144: ...138 RabbitCore RCM3305 RCM3315...
Страница 160: ......