NCV7708FDQR2G datasheet(9/22 Pages) ONSEMI

Part #	NCV7708FDQR2G

Description	Double Hex Driver

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Manufacturer	ONSEMI [ON Semiconductor]

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NCV7708F

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9

SPI Communication

Standard 16−bit communication has been implemented

for the communication of this IC to turn drivers on and off,

and to report faults. (Reference the SPI Communication

Frame Format Diagram). The LSB (Least Significant Bit) is

clocked in first.

For SPI communication, the device must first be enabled

(EN = high). The SPI inputs are TTL compatible and the SO

output high level is defined by the applied VCC. The

active-low CSB input has a pull−up resistor. SPI

communication is active when CSB is low. Providing a

pull-up resistor insures the communication bus is not active

should the communication link between the microcontroller

and NCV7708F become open. SCLK and SI have

pull−down resistors. This provides known states when the

SPI is not active.

Communication is implemented as follows:

1. CSB goes low to allow serial data transfer.

2. A 16 bit word is clocked (SCLK) into the SI

(serial input) pin. The SI input signal is latched on

the falling edge of SCLK.

3. Current SO data is simultaneously shifted out on

every rising edge of SCLK starting with the LSB

(TW).

4. CSB goes high to transfer the clocked in

information to the data registers.

(Note: SO is tristate when CSB is high.)

5. The SI data will be accepted when a valid SPI

frame is detected. A valid SPI frame consists of

the above conditions and a complete set of

multiples of 16 bit words. Invalid frames are

ignored with previous input data intact.

Figure 4. SPI Communication Frame Format

SRR

OUT

L1

OUT

H1

OUT

L2

OUT

H2

OUT

L3

OUT

H3

OUT

L4

OUT

H4

OUT

L5

OUT

H5

OUT

L6

OUT

H6

OCD

ULD

OVLO

ULD

OLD

OUT

H6

OUT

L6

OUT

H5

OUT

L5

OUT

H4

OUT

L4

OUT

H3

OUT

L3

OUT

H2

OUT

L2

OUT

H1

OUT

L1

TW

PSF

CSB

SI

SCLK

SO

LSB

MSB

01

23

456

78

9

10

11

12

13

14

15

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NCV7708FDQR2G Datasheet(PDF) 9 Page - ON Semiconductor

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