TLE8201R Datasheet, PDF (14/45 Pages) Infineon Technologies AG – Door Module Power IC

TLE 8201R
4.3
SPI
4.3.1 General
The SPI is used for bidirectional communication with a control unit. The TLE 8201R acts
as SPI-slave and the control unit acts as SPI-master. The 16-bit control word is read via
the DI serial data input. The status word appears synchronously at the DO serial data
output. The communication is synchronized by the serial clock input CLK.
Standard data transfer timing is shown in Figure 3. The clock polarity is data valid on
falling edge. CLK must be low during CSN transition. The transfer is MSB first.
The transmission cycle begins when the chip is selected with the chip-select-not (CSN)
input (H to L). Then the data is clocked through the shift register. The transmission ends
when the CSN input changes from L to H and the word which has been read into the shift
register becomes the control word. The DO output switches then to tristate status,
thereby releasing the DO bus circuit for other uses. The SPI allows to parallel multiple
SPI devices by using multiple CSN lines. The SPI can also be used with other SPI-
devices in a daisy-chain configuration.
CSN High to Low & rising edge of SCLK: SDO is enabled. Status information is transfered to Output Shift Register
CSN
CLK
CSN Low to High: Data from Shift-Register is transfered to Output Driver Logic
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
time
15 14
DI
DO
Figure 3
actual Data
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SDI: Data will be accepted on the falling edge of CLK-Signal
previous Status
EF 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
SDO: State will change on the rising edge of CLK-Signal
SPI standard data transfer timing
new Data
15 14
actual Status
15 14
4.3.2 Register Address
The 16-bit SPI frame is composed of an addressable block, an address-independent
block and a 2-bit address as shown in Figure 4.
The control word transmitted from the master to the TLE 7201R is executed at the end
of the SPI transmission (CSN L -> H) and remains valid until a different control word is
transmitted or a power on reset occurs. At the beginning of the SPI transmission (CSN
Data Sheet Rev. 2.0
14
2006-06-07