Maxim Integrated 71M6541 Demo Board - Manual (Page 58)

71M6541 Demo Board REV 3.0 User’s Manual
58 Rev 4.0
3 HARDWARE DESCRIPTION
3.1 71M6541-DB DESCRIPTION: JUMPERS, SWITCHES AND TEST
POINTS
The items described in the following tables refer to the flags in Figure 3-1.
Item #
Reference
Designator
Name Use
1 TP2 GND GND test point.
2 JP58 WPULSE 2-pin header connected to the Wh pulse LED
3 D5 Wh Wh pulse LED.
4 D6 VARh VARh pulse LED.
5 JP1 BAT MODE
Selector for the operation of the IC when main power is re-
moved. A jumper across pins 2-3 (default) indicates that no
external battery is available. The IC will stay in brownout
mode when the system power is down and it will communi-
cate at 9600bd. A jumper across pins 1-2 indicates that an
external battery is available. The IC will be able to transi-
tion from brownout mode to sleep and LCD modes when
the system power is down and it will communicate at
300bd.
6 JP44 XPULSE
3-pin header that connects XPULSE pin to the LCD. The
XPULSE pin should be configured as an LCD pin when a
jumper is placed in the 1-2 position.
7 JP45 YPULSE
3-pin header that connects YPULSE pin to the LCD. The
YPULSE pin should be configured as an LCD pin when a
jumper is placed in the 1-2 position.
8 JP53 V3P3D
2-pin header that connects the V3P3D pin to parts on the
board that use the V3P3D net for their power supply. For
supply current measurements in brownout mode, the
jumper on JP53 may be removed.
9 U5 -- The IC 71M6541 soldered to the PCB.
10 TP1
TMUXOUT,
TMUX2OUT
Test points for access to the TMUXOUT and TMU2XOUT
pins on the 71M6541.
11 BT1 --
Location of optional battery for the support of battery
modes. (Located on the bottom)
12 BT2 --
Location of optional battery for the support of RTC and
non-volatile RAM. BT2 has an alternate circular footprint at
location BT3.
3