MAX14913 datasheet(21/30 Pages) MAXIM

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Parallel Interface: Setting the OUT_ Output Driver

The parallel mode (SRIAL = low) uses one input pin (IN_)

to set each output (OUT_). Table 3 shows the settings that

depend on the configured mode.

In parallel setting mode (SRIAL = low), the MAX14913

can only be configured via the global configuration inputs:

PUSHPL and FLTR, not on a per-channel basis through

SPI. This means that all high-side drivers are either in

high-side or push-pull operation. Open-load detection is

enabled and cannot be disabled in parallel setting mode.

The MAX14912 can be configured with full flexibility in

parallel setting mode.

Serial Controller Interface

The serial interface can be used in all setting modes. It

is based on CPOL = low and CPHA = low, meaning that

the SDI data is latched-in on the rising edge of CLK and

new SDO data is written on the falling edge of CLK. The

default idle CLK state needs to be low. The SDO output

is only actively driven when the SPI master drives CS low,

it is otherwise weakly pulled down by an internal 200kΩ

resistor when CS is high.

The SPI interface provides per channel and detailed global

diagnostics. In serial setting mode (SRIAL = high), the

outputs are set on/off/high/low by the serial interface. Serial

mode also allows per channel and global configuration. In

parallel setting mode (SRIAL = low), the MAX14913 does

not allow configuration through SPI, while the MAX1912

can be configured per channel and globally.

The SPI interface can be operated in either command

mode or direct mode. Command mode is available in both

parallel and serial modes and provides higher information

content and supports more configuration options. See

Table 4 for details. Direct mode SPI is only available in

serial setting mode (SRIAL = high). In direct SPI mode,

output setting and per channel configuration is written

directly (without a command byte) and diagnostics data is

provided either in an 8 or 16-bit SPI cycle.

In both command and direct SPI modes, when the high-

side/push-pull drivers are set on/off/high/low via SPI,

the outputs change state at the end of the SPI cycle, on

the rising CS edge, with a sub 1µs propagation delay, as

defined in the Electrical Properties Table. In direct and

command mode SPI, diagnostic and status information

is sampled at the beginning of each SPI cycle, initiated

by the falling CS edge and is then sequentially written out

on SDO on each falling CLK edge. Command SPI mode

allows reading back the chip configuration and status

and diagnostics, as selected via the command byte. This

information is then written out on the following SPI cycle.

Table 3. SRIAL = Low

Table 4. SPI interface Modes Selection and Description

DRIVER MODE

IN_

OUT_ STATE

High-Side

High-side off

High-Side

High-side on

Push-Pull

Push-pull output low

Push-Pull

Push-pull output high

RESULT

SPI

MODE

SRIAL CMND

/IN2

CNFG

/IN7

S16

/IN8

BITS

SDI

SDO

NOTES

Per-channel OUT_

setting

Per-channel fault

OUT set by SPI. FAULT is the

real-time status of the fault (driver

shutdown or open-load)

Per-channel OUT_

setting and HS/PP

selection

Per-channel fault

and level

Per-channel config:

HS/PP

Per-channel fault

OUT level does not change

Per-channel config:

HS/PP and OL

detection on/off

Per-channel fault

and level

8-bit-command +

8-bit data

Previous command

output

OUT level may or may not change

depending on command

8-bit-command +

8-bit data

Previous command

output

OUT set by INx pins. MAX14912

allows SPI configuration. MAX14913

does not allow SPI configuration.

MAX14912/MAX14913

Octal High-Speed, High-Side

Switch/Push-Pull Driver

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