BUK3F00-50WDXX Datasheet, PDF (14/52 Pages) NXP Semiconductors – Controller for TrenchPLUS FETs

NXP Semiconductors
BUK3F00-50WDxx
Controller for TrenchPLUS FETs
SCSN
SCLK
SDI
MSB
LSB MSB
LSB
SDO
MSB
LSB MSB
LSB
high byte
low byte
Fig 4. SPI communication frame: full 16-bit operation
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To support 8-bit microcontrollers an 8-bit operation is possible; see Figure 5. In this
operation, SCSN is taken HIGH between the 8-bit bytes. SDO is taken HIGH before the
SCLK of the low byte to indicate that the low byte is to be sent.
SCSN
SCLK
SDI
MSB
LSB
MSB
LSB
SDO
MSB
high byte
LSB
MSB
LSB
low byte
Fig 5. SPI communication frame: 8-bit operation
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A number of devices can be daisy chained by connecting the SDO of the first device to the
SDI of the next device and so on; see Figure 6.
All devices have their SCSN inputs connected to the same controller chip select so that
they can be selected together. When n devices are daisy chained, then n SPI 16-bit word
cycles must be executed to program all devices. Daisy chaining cannot be used with 8-bit
SPI operation.
BUK3F00-50WDXX_4
Product data sheet
Rev. 04 — 4 September 2008
© NXP B.V. 2008. All rights reserved.
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