TPIC44H01

4-CHANNEL SERIAL AND PARALLEL HIGH-SIDE PRE-FET DRIVER

SLIS088 – SEPTEMBER 1998

2

POST OFFICE BOX 655303

description (continued)

The 8-bit serial peripheral interface (SPI) allows the user to command any of the four outputs on or off, to

program one of eight possible open-load, over-current, and short-load fault deglitch timer settings, and to

engage the sleep state. Data is clocked into the SDI pin on the rising edge of SCLK and clocked out of the SDO

pin on the SCLK falling edge. The serial input bits are logic OR’ed with the IN1-IN4 parallel inputs pins. The serial

interface is also used to read normal-load, open-load, over-current, and short-to-ground conditions for each

channel. Over-voltage lockout can be detected when the FLT pin is low and no bits are set in the SDO register.

Multiple TPIC44H01 devices may be cascaded together using the serial interface to further reduce I/O lines from

the host controller.