TLE 6209 R

Data Sheet, Version 3.0

5

2001-10-15

2

Circuit Description

2.1

Serial Peripheral Interface (SPI)

The SPI is used for bidirectional communication with a control unit. The 8-bit

programming word or control word (see Table 1) is read in via the SDI serial data input,

and this is synchronized with the serial clock input SCLK. The status word appears

synchronously at the SDO serial data output (see Table 4).

The transmission cycle begins when the chip is selected with the chip-select-not (CSN)

input (H to L). When the CSN input changes from L to H, the word which has been read

into the shift register becomes the control word. The SDO output switches then to tristate

status, thereby releasing the SDO bus circuit for other uses. The SPI allows to parallel

multiple SPI devices by using multiple CSN lines. Due to the full duplex shift register, the

TLE 6209 R can also be used in daisy-chain configuration.

The settings made by the SPI control word become active at the end of the SPI

transmission and remain valid until a different control word is transmitted or a power on

reset occurs. At each SPI transmission, the diagnosis bits as currently valid in the error

logic are transmitted. The behavior of the diagnosis bits is described in Section 2.5.

Table 1

Input Data Protocol

Bit

7

Status Register Reset: H = reset

6

OVLO: H = on, L = off

5

not used

4

MSB of 2bit chopper-OFF-time

3

LSB of 2bit chopper-OFF-time

2

PWM Operation mode: H = Fast decay, L = Slow decay

1

MSB of 2 bit chopper current limit

0

LSB of 2 bit chopper current limit