MAX6951EVKIT MAXIM [Maxim Integrated Products], MAX6951EVKIT Datasheet - Page 6

• Manufacturer Part Number: MAX6951EVKIT
• Description: MAX6951 Evaluation Kit
• Manufacturer: MAXIM [Maxim Integrated Products]

MAX6951 Evaluation Kit
Table 2. JU2 to JU5 Functions
*See JU6 and JU1 for configuring the EV kit’s circuit voltage to match the external controller’s voltage.
Table 3. JU6 Functions
Table 4. JU7 Functions
6
(PC shorting trace cut
Table 1. JU1 Functions
*See JU6 for configuring the EV kit for +3.3V or user-selectable voltage.
open, wire soldered
LOCATION
JUMPER/SHORT
JUMPER
JUMPER
(default)
(PC trace shorts
to pins 2 and 3)
SHORT
1 and 2
2 and 3
_______________________________________________________________________________________
pins 1 and 2)
LOCATION
JU1
JU1
JU2
JU3
JU4
JU5
JU2
JU3
JU4
JU5
1 and 2
2 and 3
Connected
to resistors
R5 and R6
Connected
to GND
PC BOARD TRACE
PC BOARD TRACE
MAX604
SET PIN
JUMPER,
JUMPER,
Cut open
Cut open
Cut open
Cut open
Cut open
Shorted
Shorted
Shorted
Shorted
Shorted
Connected to
capacitor C6
Connected to
EXT_OSC pad
and TTL/CMOS
clock
MAX6951
OSC PIN
User-selected voltage, +2.7V
to +5.5V range, VIN range
+5.5V to +6.5V at 500mA
+3.3V mode, VIN range
+4.0V to +6.5V at 500mA
U3 level translator CLK signal isolated
from EV kit
U3 level translator CS signal isolated
from EV kit
U3 level translator DIN signal isolated
from EV kit
U3 level translator V
U3 level translator provides CLK signal
U3 level translator provides CS signal
U3 level translator provides DIN signal
U3 level translator powered from V
EV KIT MODE
LDO linear regulator U2 supplies power
LDO linear regulator U2 output isolated
from EV kit’s V
4MHz, set by
capacitor C6
and resistor R4
External TTL/CMOS
clock range
(1MHz to 8MHz) for
the external oscillator
OSCILLATOR
FREQUENCY
JUMPER FUNCTION
JUMPER FUNCTION
CC
pins
CC
pin isolated
(+2.7V to +5.5V), the PC board trace shorting pins 2
and 3 of jumper JU6 must be cut open. Voltage-divider
resistors R5, R6, and a wire shorting pins 1 and 2 of
jumper JU6 must be installed. Use the following equa-
tion to determine the value for resistor R5. R6 can range
up to 1.5MΩ, and 249kΩ is a good starting point:
The MAX6951 EV kit features a jumper to select the oscil-
lation frequency source. The MAX6951 is configured to
oscillate nominally at 4MHz by external components
capacitor C6 and resistor R4. The user can connect an
external TTL/CMOS clock oscillator to the EXT_OSC pad
to evaluate other frequencies (1MHz min to 8MHz max).
The 3-pin jumper JU7 selects the source for the
MAX6951 oscillator frequency. Table 4 lists the various
jumper options.
Problem: Cannot find the MAX6951 EV kit’s parallel
port connection.
Ensure that the I/O extension cable is connected to a
parallel port, and not a SCSI or other type of port. Verify
CC
rail
LDO supplies +3.3V or user-selectable voltage*
EXT_VCC pad supplies EV kit power, range
+2.7V to +5.5V
Stand-alone, external controller connected to
CLK pad*
Stand-alone, external controller connected to
CS pad*
Stand-alone, external controller connected to
DIN pad*
U3 power disconnected, translator not required
PC/software control through parallel port
PC/software control through parallel port
PC/software control through parallel port
U3 power connected, translator required
Evaluating Other Oscillator Frequencies
R5 = R6 x ((V
OUT
EV KIT MODE
EV KIT MODE
/ 1.20) - 1)
Troubleshooting