MAX14900DEVKIT datasheet(3/17 Pages) MAXIM

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Evaluates: MAX14900E

MAX14900E Evaluation Kit

to control and monitor the device, attach a voltage repre-

senting the external logic to TP33 (VL), and attach a shunt

to J3 (VL) between the center and right posts.

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.

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.

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.

Serial Mode Through External Circuitry

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

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.

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