VNI8200XP-32 Datasheet, PDF (20/43 Pages) STMicroelectronics – Octal high-side smart power solid-state relay with serial

Pin function description
VNI8200XP-32
9
9.1
Pin function description
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^a
SEL2 = L
Pin
SPI operation
parallel operation
SDO/IN8
SDO Serial data output
IN8 Input to channel 8
SS /IN7
SS
Slave select
IN7 Input to channel 7
CLK/IN6
SDI/IN5
WD/IN4
OUT_EN/IN3
WD_EN/IN2
SEL1/IN1
CLK
SDI
WD
OUT_EN
WD_EN
SEL1
Serial clock
Serial data input
Watchdog input
IC OUTPUT enable / disable
Watchdog enable / disable and timing preset
8/16-bit SPI selection mode
IN6 Input to channel 6
IN5 Input to channel 5
IN4 Input to channel 4
IN3 Input to channel 3
IN2 Input to channel 2
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
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a _{SEL2 has an internal weak pull-down.}
DocID027849 Rev 3