User`s guide

Hardware Components
26 M1 System Management Board User’s Guide
TRIM_VOL
This pin is an input to the digital brick controlled by the M1AFS1500-FG484 I/O with a PWM control. The PWM
output can be configured using different RC values on the surface mount pads (Figure 2-12).
Figure 2-12. TRIM_VOL
This pin can be used to trim the output voltage of the digital brick. The trim voltage varies based on the type of digital
brick being used.
Smart Battery
Battery operation of the System Management Board includes battery backup, charging, and discharging routines using
the M1AFS1500-FG484 device.
A maximum 7.2 V NiMH 2100 mAh battery can be plugged in the two pin header JP4. The battery operates for
approximately 15 to 20 minutes. Make sure the polarity of the battery matches the silkscreen on the header. A
temperature diode can be plugged in the two pin header JP5 and can be placed on the battery to monitor temperature,
see Table 2-20.
5 V Power
TRIM_VOL
A
FS Pad
R224
R207
C36
R206
Table 2-20 · Switch Settings
Header Function
JP4 pin 1 GND
JP4 pin 2 Battery Voltage
JP5 pin 1 TRN – Temperature Diode
1/JP5 pin 2 AT – Temperature Diode