71M6521 Demo Board User’s Manual
Revision 2.18
© 2005-2009 TERIDIAN Semiconductor Corporation
Page: 71 of 111
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HARDWARE DESCRIPTION
3.1 D6521T4A7 DEMO BOARD DESCRIPTION: JUMPERS, HEADERS,
SWITCHES, TEST POINTS, CONNECTORS
This description covers the D6521T4A7 Demo Board. The D6521T4A8 and D6521T4A10, Demo Boards
have similar jumpers, switches, test points and connectors.
The items described in the following tables refer to the flags in Figure 3-1.
Item #
(Figure
3.1)
Schematic &
Silk Screen
Reference
Name
Use
1
TP15
GND
Test point for board ground
2
TP2
VA, REFA
2-pin header test point. Pin 1 is the VA line voltage input to the IC,
pin 2 is REFA.
3
D5
Wh
Wh LED (real energy)
4
D6
VARh
VARh LED (reactive energy)
5
JP12
BAT_MODE
This 3-pin header allows selection of the battery mode operation: A
jumper across pins 1-2 indicates that
no external battery
is
available. The 71M6521 will stay in brownout mode when system
power is down and it will communicate at 9600bd.
A jumper across pins 2-3 indicates that an
external battery
is
available. The 71M6521 will be able to transition from brownout
mode to sleep and LCD modes when system power is down and it
will communicate at 300bd.
6
J12
V3P3, OPT_TX,
V3P3,
OPT_RX, GND
5-pin header. Pins 1 and 3 carry the supply voltage to the 6521 IC.
Pin 2 is the TX_OPT output of the 6521 IC. Pin 4 is the OPT_RX
input to the 6521 IC. Pin 5 is ground.
7
TP21
Test points for pulses generated by the VARh LED.
8
SW1
RESET
Chip reset switch: The RESET pin has an internal pull-down
thatallows normal chip operation. When the switch is pressed, the
RESET pin is pulled high which resets the IC into a known state.
Note: The RESET button may be disabled in the Demo Board
default configuration. The RESET button can be enabled by
removing R91.
9
TP22
Test points for pulses generated by the Wh LED.
10
JP8
GND, VBAT
3-pin header for connection of an external battery (+ at pin 2, - at
pin 3). If no battery is connected, a jumper must be installed across
pins 1-2.
11
JP4
ICE enable
Selector for ICE/regular operation:
Jumper 1-2 = regular operation (default)
Jumper 2-3 = ICE operation
Remove this jumper for brownout current measurements!
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