Evaluates: MAXQ3210
Additional Hardware Features
Most of the additional hardware on the MAXQ3210 EV
kit, such as the piezoelectric horn, LED and digital
potentiometer, can be enabled or disabled by setting
or removing jumpers. Disabling unused hardware frees
up the associated port pins for other uses.
Using the RC Oscillator Clock Option
To run the MAXQ3210 EV kit using the RC oscillator,
remove the crystal at Y1, close jumper JU3, and popu-
late R3 and C4 with appropriate components. (Refer to
the MAXQ3210 data sheet for appropriate resistor and
capacitor values for a given frequency.)
Because the XT/
RC
bit in the CKCN register is set to 1
(selecting crystal mode) upon power-up, the MAXQ3210
will always come out of power-up and attempt to run
from an external crystal. If the RC circuit option is popu-
lated instead, the crystal oscillator does not start, and the
MAXQ3210 continues running on the internal ring oscilla-
tor (approximately 8kHz) until the loaded program
firmware sets the XT/
RC
bit to 0. If the MAXQ3210 is not
loaded, it continues running from the internal ring indefi-
nitely, which means it is running too slowly to communi-
cate using the standard JTAG firmware.
If this occurs, you can communicate with the slow-run-
ning MAXQ3210 by loading the
jtag_1kHz.hex
file
(provided on the EV kit CD-ROM) into the serial-to-
JTAG board and then using MTK or MAX-IDE as usual.
Note that this version performs the master erase, load-
ing, and debug operations much more slowly than
usual due to the reduced communications speed, so as
soon as you have loaded program firmware into the
MAXQ3210 that sets the XT/
RC
bit to 0 upon startup,
you can reload the normal serial-to-JTAG board
firmware to go back to normal tools operation.
MAXQ3210 Evaluation Kit
4
_____________________________________________________________________
JUMPER
SETTING
EFFECT
JU1
(No jumper)
REGOUT is not connected to JTAG
5V. (Drive from internal regulator or
bench supply.)
*
JU1
Pins 1 and 2
connected
REGOUT is connected to the 5V
supply from the JTAG board.
JU2
(No jumper)
The power supply at J2 is not used.
JU2
Pins 1 and 2
connected
The J2 power supply (which should
be 9V) is connected to the V
BAT
pin.
This configuration should only be
used with the J1 battery clip empty.
JU2
Pins 2 and 3
connected
The J2 power supply (which should
be 5V) is connected to the REGOUT
pin. When using this configuration,
the JU1 jumper must be
disconnected and the J1 battery clip
must be empty.
Table 1. Power-Supply Jumper Settings
JUMPER
WHEN OPEN
WHEN CLOSED
JU3
No effect.
The RC oscillator circuit may
be used to drive the
MAXQ3210 clock. To use this
feature, Y1 must be empty, and
R3 and C4 must be populated
with appropriate components.
JU5, JU7,
JU8
The piezoelectric
horn is disabled.
The piezoelectric horn is
enabled.
JU4, JU6
The piezoelectric
horn operates at
reduced volume.
The piezoelectric horn
operates at full volume.
JU9
No effect.
Port pin P0.0 is connected to
pin
CS
of the MAX5160 digital
potentiometer.
JU10
No effect.
Port pin P1.5 is connected to
pin
INC
of the MAX5160 digital
potentiometer.
JU11
No effect.
Port pin P0.5 (comparator
input) is connected to the
wiper pin of the MAX5160.
JU12
No effect.
Port pin P1.6 is connected to
pin U/
D
of the MAX5160 digital
potentiometer.
JU13
No effect.
Port pin P0.7 (LED drive) is
connected to the red LED D3.
Table 2. Other Jumper Settings
* Refer to the MAXQ3210 data sheet for the allowable range of
supply at REGOUT.
