MAX14900E Evaluation Kit
Evaluates: MAX14900E
General Description
The MAX14900E octal high-speed, industrial, high-side
switch evaluation kit (EV kit) is a fully assembled and
tested surface-mount printed circuit board (PCB) that
demonstrates the capabilities of the MAX14900E IC to
drive industrial-grade signals.
This EV kit demonstrates operation in all MAX14900E
modes. In parallel mode, jumpers allow for arbitrary
configuration. In serial mode, or parallel mode with serial
monitoring, attach a control circuit to the appropriate test
points, as detailed below.
Features
●
Stand-Alone Operation in Parallel Mode
●
SPI-Controlled for Serial Mode/Monitored-Parallel
Mode
●
Built-In 5V Regulator
●
Surge-Compliance Clamp Diodes Included
●
Fully Assembled and Tested
Ordering Information
appears at end of data sheet.
MAX14900E EV Kit PCB Photo
19-7641; Rev 0; 5/15
MAX14900E Evaluation Kit
Evaluates: MAX14900E
Quick Start
Recommended Equipment
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MAX14900E EV kit
Function generator
Oscilloscope
50Ω, 15W (minimum) load resistor
5kΩ resistor
Voltmeter
Bench tie clips with spring clips on both ends
24V, 2A power supply
19) Observe the output waveform on the oscilloscope.
Detailed Description
The MAX14900E octal, high-speed, industrial, high-side
switch EV kit is a fully assembled and tested, surface-
mount PCB that demonstrates the capabilities of the
MAX14900E IC to drive industrial-grade signals.
This EV kit demonstrates operation in all MAX14900E
modes. In parallel mode, jumpers allow for arbitrary
configuration. In serial mode, or in parallel mode with
serial monitoring, attach a control circuit to the appropriate
test points. The EV kit operates from a single 24V
(11V to 36V) main supply, and an optional logic supply.
Through parallel or serial control, the IC switches the
24V supply to any combination of eight independent
outputs. Besides the device itself, there are plenty of
attach points, as well as numerous jumpers. The EV kit
has little added circuitry.
TVS diode D18 protects the device from surges that may
appear on the supply line through the clamp diodes.
Note that D18 will likely be destroyed if the user applies
a voltage greater than 36V on the 24V supply. Sixteen
silicon diodes (D2–D17) protect the individual MAX14900E
power outputs from severe inductive kickback events,
as well as surges. A linear regulator, MAX5084 (U2),
provides an optional default 5V in case the user does
not wish to provide a logic-level supply externally. LED1
(FAULT) can be optionally configured to light whenever
the device indicates a fault condition on its
FAULT
pin.
LED2 (CERR) can be optionally configured to light when
the device detects a CRC error in serial mode.
Procedure
1)
2)
3)
4)
5)
6)
7)
8)
The EV kit is fully assembled and tested. Follow the steps
below to verify board operation:
Preset the 24V power supply to 24V and disable the
power supply.
Connect the ground of the 24V power supply to
jumper J2.
Connect the positive supply of the 24V power supply
to J1.
Ensure that the shunt for J15 (EN) is installed.
Ensure that the shunt for J16 (connect V
L
to 5V) is
installed.
Ensure that J22 (PUSHPL) is installed.
Ensure that all other shunts are not installed.
Preset the function generator to pulse, 20ms pulse
width, 500ms repetition rate, low-voltage 0V, high-
voltage 5V, and disable the pulse generator.
Connect a 5kΩ resistor between O1 (TP11) and
GND (TP12).
9)
Input Power Supply
10) Connect an oscilloscope between O1 (TP11) and
GND (TP12).
11) Connect the function generator between IIN1 (TP1)
and GND (TP10).
12) Enable the 24V power supply.
13) Enable the function generator.
14) Observe the output waveform on the oscilloscope.
15) Disable the function generator.
16)
Change the resistor from 5kΩ to 50Ω.
17) Remove the shunt on J22 (PUSHPL).
18) Enable the function generator.
The EV kit obtains its primary power from a bench supply
whose positive voltage attaches to J1 (24V), and whose
return voltage attaches to J2 (GND). This supplies power
only to the MAX14900E.
5V Power Supply
The device requires a 5V supply on pin 30 (V5), supplied
by the 5V linear regulator (U2) for the user’s convenience.
Logic Power Supply
Most of the device’s digital pins have their input thresh-
olds and their output drive levels defined by the voltage
on pin 13 (V
L
). This V
L
supply can come from two places.
First, the built-in 5V regulator can supply V
L
by attaching
a shunt to J16 (connect V
L
to 5V), ensuring that no shunt
is attached to J3 (V
L
). When attaching external circuitry
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MAX14900E Evaluation Kit
Evaluates: MAX14900E
to control and monitor the device, attach a voltage repre-
senting the external logic to TP33 (V
L
), and attach a shunt
to J3 (V
L
) between the center and right posts.
Serial Mode Through External Circuitry
Paralleling Outputs
The EV kit makes it easy to parallel up to four outputs
together to deal with higher loads. J8, J10, and J12, when
shunted, connect outputs O1–O4 together in various
configurations. Similarly, J9, J11, and J13, when shunted,
connect outputs O5–O8 in various configurations. To
determine which outputs short to what, see
Table 1
for
jumper and output information. The copper traces on the
board are also evident from output to each jumper.
To drive the serial SPI interface of the device through
external circuitry, ensure that J4–J7 each have shunts
attached between the center and right posts. Then, attach
the corresponding external SPI controls with TP34–TP37.
The state of the SRIAL pin must be set appropriately. If
running in monitored-parallel mode, SRIAL must be low
(J18 has no shunt). If running in serial mode, J18 must
be shunted.
Dual-Function Configuration Pins
Dedicated Configuration Pins
J15 (EN), J20 (FLTR), and J22 (PUSHPL) set their
respective pins high. When not shunted, these pins are
driven logic-low from individual pulldowns inside the
device.
When running in serial mode (not monitored-parallel mode
or parallel mode), IN1, IN3, IN7, and IN8 become extra
configuration pins. These pins are driven logic-low through
weak internal pulldowns inside the device, but can be set
high attaching shunts to J14, J17, J19, or J21.
Refer to the MAX14900E IC data sheet for a detailed
description of these pin functions. Additionally, in serial
mode, IN4 becomes an open-drain output, indicating a
CRC error in a received serial-command stream. To see
the state of this pin in serial mode, attach a shunt between
the left and center posts of J24. LED2 glows red in case
of a CRC error.
Parallel Mode
To put the EV kit in parallel mode, ensure that no shunt is
attached to J18 (SRIAL). Fault conditions can be monitored
in two ways. First, attach a shunt between the right and
center pins of J23. LED1 glows red whenever the device
reports a fault condition. Otherwise, a fault condition can be
monitored by attaching external monitoring circuitry to TP31
(FAULT). The MAX14900E
FAULT
pin is open-drain.
If the external circuitry attached to TP31 (FAULT) has a pul-
lup, ensure that J23 has no shunts attached. If the exter-
nal circuitry has no pullup, attach a shunt to J23 between
the left and center posts. External circuitry drives the
parallel inputs at TP1–TP8. See
Table 3,
describing how
these control signals on TP1–TP8 determine the state
of the outputs O1 through O8. In addition, three signals
control how the TP1–TP8 control inputs are interpreted,
as detailed in
Table 4.
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MAX14900E Evaluation Kit
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Table 1. Jumper Description (J3–J32)
JUMPER
J3
SHUNT POSITION
LEFT
RIGHT
OPEN*
LEFT
J4
RIGHT
OPEN*
LEFT
J5
RIGHT
OPEN*
LEFT
J6
RIGHT
OPEN*
LEFT
J7
RIGHT
OPEN*
J8
J9
J10
J11
J12
J13
J14
J15
J16
J17
J18
J19
SHUNTED
OPEN*
SHUNTED
OPEN*
SHUNTED
OPEN*
SHUNTED
OPEN*
SHUNTED
OPEN*
SHUNTED
OPEN*
SHUNTED
OPEN*
SHUNTED*
OPEN
SHUNTED*
OPEN
SHUNTED
OPEN*
SHUNTED
OPEN*
SHUNTED
OPEN*
Do not use
V
L
powered by TP33 (V
L
)
V
L
powered by the 5V regulator (see J16)
Do not use
SCLK driven by signal on TP34 (SCLK)
SCLK not driven
Do not use
SDI driven by signal on TP35 (MOSI)
SDI not driven
Do not use
SDO drives signal on TP36 (MISO)
SDO not driven
Do not use
CS
driven by signal on TP37 (CS)
CS
not driven
Outputs TP11 (O1) and TP13 (O2) connected
Outputs TP11 (O1) and TP13 (O2) separate
Outputs TP20 (O5) and TP23 (O6) connected
Outputs TP20 (O5) and TP23 (O6) separate
Outputs TP13 (O2) and TP15 (O3) connected
Outputs TP13 (O2) and TP15 (O3) separate
Outputs TP23 (O6) and TP25 (O7) connected
Outputs TP23 (O6) and TP25 (O7) separate
Outputs TP15 (O3) and TP18 (O4) connected
Outputs TP15 (O3) and TP18 (O4) separate
Outputs TP25 (O7) and TP28 (O8) connected
Outputs TP25 (O7) and TP28 (O8) separate
TP1 (IN1) pulled to V
L
TP1 (IN1) internally pulled weakly to ground
EN pulled to V
L
EN internally pulled weakly to ground
Power V
L
from the built-in 5V regulator
Power V
L
according to J3
TP3 (IN3) pulled to V
L
TP3 (IN3) internally pulled weakly to ground
SRIAL pulled to V
L
SRIAL internally pulled weakly to ground
TP7 (IN7) pulled to V
L
TP7 (IN7) internally pulled weakly to ground
DESCRIPTION
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MAX14900E Evaluation Kit
Evaluates: MAX14900E
Table 1. Jumper Description (J3–J32) (continued)
JUMPER
J20
J21
J22
SHUNT POSITION
SHUNTED
OPEN*
SHUNTED
OPEN*
SHUNTED*
OPEN
LEFT
J23
RIGHT*
OPEN
LEFT
J24
RIGHT
OPEN*
J25-J32
*Default position.
SHUNTED
OPEN*
FLTR pulled to V
L
FLTR internally pulled weakly to ground
TP8 (IN8) pulled to V
L
TP8 (IN8) internally pulled to ground
PUSHPL pulled to V
L
PUSHPL internally pulled to ground
FAULT
output pulled to V
L
with 10KΩ
FAULT
output state indicated by LED1 (FAULT)
FAULT
output not pulled up
IN4 pulled to V
L
with 10KΩ
IN4 state indicated by LED2 (CERR)
IN4 not pulled up
Do not use
Do not use
DESCRIPTION
Table 2. Test Point Description
TEST POINT
TP1 (IN1)
TP2 (IN2)
TP3 (IN3)
TP4 (IN4)
TP5 (IN5)
TP6 (IN6)
TP7 (IN7)
TP8 (IN8)
TP9 (GND)
TP10 (GND)
TP11 (O1)
TP12 (GND)
TP13 (O2)
TP14 (GND)
TP15 (O3)
TP16 (GND)
TP17 (SRIAL)
TP18 (O4)
TP19 (GND)
TP20 (O5)
DESCRIPTION
Drive IN1 when in parallel mode
Drive IN2 when in parallel mode
Drive IN3 when in parallel mode
Drive IN4 when in parallel mode
Drive IN5 when in parallel mode
Drive IN6 when in parallel mode
Drive IN7 when in parallel mode
Drive IN8 when in parallel mode
Ground attach point
Ground attach point
Connect a load to O1 here
Connect the O1 return here
Connect a load to O2 here
Connect the O2 return here
Connect a load to O3 here
Connect the O3 return here
Drive SRIAL here
Connect a load to O4 here
Connect the O4 return here
Connect a load to O5 here
TEST POINT
TP21 (GND)
TP22 (PUSHPL)
TP23 (O6)
TP24 (GND)
TP25 (O7)
TP26 (GND)
TP27 (FLTR)
TP28 (O8)
TP29 (GND)
TP30 (EN)
TP31 (FAULT)
TP32 (GND)
TP33 (V
L
)
TP34 (SCLK)
TP35 (MOSI)
TP36 (MISO)
TP37 (CS)
TP38 (GND)
DESCRIPTION
Connect the O5 return here
Drive PUSHPL here (see also J22)
Connect a load to O6 here
Connect the O6 return here
Connect a load to O7 here
Connect the O7 return here
Drive FLTR here (see also J20)
Connect a load to O8 here
Connect the O8 return here
Drive EN here (see also J15)
Indicate the state of
FAULT
here
Digital interface ground attach point
Connect an external V
L
supply here
(see also J3 and J6)
Drive optional SPI clock here
Drive optional SPI MOSI here
Receive optional SPI MISO here
Drive optional SPI
CS
here
SPI interface ground attach point
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