VNI8200XP View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
VNI8200XP
STMicroelectronics
VNI8200XP Datasheet PDF : 43 Pages
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VNI8200XP
9.5
Slave select
Pin function description
If SEL2 = H, the slave select ( SS ) signal is used to enable the VNI8200XP serial
communication shift register; data is flushed-in through the SDI pin and flushed-out from
the SDO pin only when the SS pin is low. On the SS pin falling edge the shift register
(containing the fault conditions) is frozen, so any change on the power switches status is
latched until the next SS falling edge event and the SDO output is enabled. On the SS
pin rising edge event the 8/16 bits present on the SPI shift register are evaluated and the
outputs are driven according to this frame. If more than 8/16 bits (depending on the SPI
settings) are flushed inside only the last 8/16 are evaluated; the others are flushed out from
the SDO pin after fault condition bits; in this way a proper communication is possible also in
a daisy chain configuration.
Figure 5: SPI mode diagram
9.6
8/16-bit selection (SEL1)
If SEL2 = H, SEL1 is used to select between two possible SPI configurations: the 8-bit SPI
mode (SEL1 = L) and the 16-bit SPI mode (SEL1 = H). 8/16-bit SPI operation is described
below.
9.7
Output enable (OUT_EN)
If SEL2 = H, the OUT_EN pin provides a fast way to disable all the outputs simultaneously.
When the OUT_EN pin is driven low for at least TRES, the outputs are disabled while fault
conditions in the SPI register are latched. To enable the outputs, the OUT_EN pin should
be raised and the IC should be re-programmed through the SPI interface. As fault
conditions are latched inside the IC and SPI interface also works while the OUT_EN pin is
driven low, the SPI can be used to detect if a fault condition occurred before than the reset
event.
The device is ready to operate normally after a TSU period. The OUT_EN pin is the fastest
way to disable all outputs when a fault occurs.
DocID15234 Rev 9
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