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MAX16031 Evaluation Kit
USB-Host Interface
The MAX16031 EV kit includes a built-in USB-to-
JTAG/I 2 C host interface. The host interface uses
Maxim ’s MAX3420 USB peripheral controller, along
with a MAXQ2000 microcontroller to communicate with
the host PC and generate the I 2 C/JTAG bus signals.
Three indicators (LED101, LED102, LED103) provide
status information of the host interface. LED101 lights
during EEPROM write operations, LED102 lights during
I 2 C or JTAG bus activity, and LED103 lights when the
software is communicating to the EV kit.
To facilitate prototype development and programming,
the host interface can be used to interface with a
MAX16031 on another board by turning off switches
1-7 in switch bank S2. This disconnects the on-board
MAX16031 from the JTAG and I 2 C buses. Connect to
the other board using P1 and P2. The pinout of each
connector is shown in Tables 2 and 3. Note that the I 2 C
pullup resistors are located on the EV kit.
The on-board MAX16031 can be connected to an
external JTAG or I 2 C interface by turning switch bank
S3 (switches 1-7) off while keeping switch bank S2
(switches 1-7) on. Connect the external interface to P2
for JTAG or P1 for I 2 C. The MAX16031 can be com-
pletely disconnected from the on-board USB host inter-
face by using this technique, while providing external
power to EXT PWR (J100 must be in the EXT position),
and disconnecting the on-board DACs by turning off all
the switches in switch bank S1.
Each interface can be disconnected or connected sep-
arately. I 2 C uses switches 1-3 on both S2 and S3 while
JTAG uses switches 4-7 on both S2 and S3.
Power Source
The MAX16031 IC can be powered from one of three
possible power supplies, controlled by jumper J100. To
power directly from the USB 5V supply, place the
jumper in the 5V position. To power from the on-board
3.3V regulator, place the jumper in the 3.3V position.
When the jumper is in the EXT position, the MAX16031
can be powered from an external power supply con-
nected to the EXT PWR test point. Do not supply a volt-
age higher than 14V.
Serial Interfaces
The MAX16031 has both a JTAG interface and an I 2 C
serial interface. The slave address of the on-board
MAX16031 can be set using J1 and J2, according to
Table 4.
Voltage Monitoring
The eight voltage monitoring inputs connect to pins on
P3 located on the left side of the board. Switch bank S1
allows each input to be connected to the output of a
DAC, which allows the voltage to be set using the EV kit
software for ease of evaluation. The DAC output voltage
range is limited to 2.5V. Do not attempt to force an
external voltage while the DAC is connected; doing so
could damage the DAC or the external voltage source.
Current Monitoring
The current-sense inputs are connected to pins on
header P3 and can be used in two ways. A small volt-
age source can be applied directly across CS+ and
CS-, which the MAX16031 will measure directly. For this
situation, J3 must be closed, which connects CS+ to
V CC to ensure proper bias. As an alternative, a current-
sense resistor can be soldered in the R23 position and
CS+ and CS- can be connected in series with the
external circuit to be measured.
If an external bias voltage is to be used, remove J3 and
connect the CS+ pin of P3 to the external source. Do
not supply a bias voltage higher than 28V. The current-
sense circuit in the MAX16031 will not function for bias
voltages less than 3V.
Temperature Monitoring
One of the temperature sensors is internal and the
other two are external. Both external temperature sen-
sors are included on the EV kit as Q1 and Q2, which
are diode-connected 2N3904 transistors. These can be
desoldered and replaced if necessary. The connec-
tions are easily accessible through header P5.
Inputs and Outputs
Each output has a separate indicator LED and pullup
resistor, and each signal is brought out to a pin on P4.
An LED will light to indicate that the associated output
has gone to the logic-low state. The LEDs can be dis-
abled by turning off switch 8 in switch bank S2. The
pullup resistors are controlled by J4. To use an external
pullup voltage, connect J4 in the 2-3 position and con-
nect the voltage source to the VPU pin of P4.
GPIO1 and GPIO2 can also function as inputs. If they
are configured as such, connect the external input to
the GPIO1 or GPIO2 pin of P4.
A test point (REF) is provided to confirm the reference
voltage of the MAX16031, which is 1.4V (nominal). Do
not connect loads to this test point.
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