VNI8200XP-32 datasheet(20/43 Pages) STMICROELECTRONICS

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Pin function description

VNI8200XP-32

20/43

DocID027849 Rev 3

Pin function description

9.1

SPI/parallel selection mode (SEL2)

This pin allows the selection of the IC interfacing mode. The SPI interface is selected if

SEL2 = H, while the parallel interface is selected if SEL2 = L, according to :

Table 13: Pin function description

SEL2 = H

SPI operation

SEL2 = L

parallel operation

SDO/IN8

SDO

Serial data output

IN8

Input to channel 8

SS /IN7

Slave select

IN7

Input to channel 7

CLK/IN6

CLK

Serial clock

IN6

Input to channel 6

SDI/IN5

SDI

Serial data input

IN5

Input to channel 5

WD/IN4

Watchdog input

IN4

Input to channel 4

OUT_EN/IN3

OUT_EN

IC OUTPUT enable / disable

IN3

Input to channel 3

WD_EN/IN2

WD_EN

Watchdog enable / disable and timing preset

IN2

Input to channel 2

SEL1/IN1

SEL1

8/16-bit SPI selection mode

IN1

Input to channel 1

9.2

Serial data in (SDI)

If SEL2 = H, this pin is the input of the serial control frame. SDI is read on CLK rising edges

and, therefore, the microcontroller must change SDI state during the CLK falling edges.

After the SS

falling edge, the SDI is equal to the most significant bit of the control frame

(Figure 5: "SPI mode diagram").

9.3

Serial data out (SDO)

If SEL2 = H, this pin is the output of the serial fault frame. SDO is updated on CLK falling

edges and, therefore, the microcontroller must read SDO state during the CLK rising

edges.

The SDO pin is tri-stated when SS

signal is high and it is equal to the most significant bit

of the fault frame after the SS

falling edge (Figure 5: "SPI mode diagram").

9.4

Serial data clock (CLK)

If SEL2 = H, the CLK line is the input clock for serial data sampling. On CLK rising edge the

SDI input is sampled by the IC and the SDO output is sampled by the host microcontroller.

On CLK falling edge, both SDI and SDO lines are updated to the next bit of the frame, from

the most to the less significant one (see Figure 5: "SPI mode diagram"). When the SS

SEL2 has an internal weak pull-down.

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