TLE8108EM Infineon Technologies, TLE8108EM Datasheet - Page 21

• Manufacturer Part Number: TLE8108EM
• Manufacturer: Infineon Technologies

Specifications of TLE8108EM

• Packages: PG-SSOP-24
• Thermal Class: Exposed Pad
• Id Nom: 8 x 0.5 A
• Pin Count: 24.0 Pins
• Channels: 8.0
• Comment: 8 channel realy and LED driver

8
The diagnosis and control interface is based on a serial peripheral interface (SPI).
The SPI is a full duplex synchronous serial slave interface, which uses four lines: SO, SI, SCLK and CS. Data is
transferred by the lines SI and SO at the data rate given by SCLK. The falling edge of CS indicates the beginning
of a data access. Data is sampled in on line SI at the falling edge of SCLK and shifted out on line SO at the rising
edge of SCLK. Each access must be terminated by a rising edge of CS. A modulo 8 counter ensures that data is
taken only, when a multiple of 8 bit has been transferred, while the minimum of 16 bit is also taken into
consideration. Therefore the interface provides daisy chain capability even with 8 bit SPI devices.
Figure 10
The SPI protocol is described in
Standby mode (all the channels in Clear mode).
8.1
There is one internal register where the diagnosis information is stored and a shift register used for transmitting
the information via SO.
CS - Chip Select:
The system microcontroller selects the TLE8108EM by means of the CS pin. Whenever the pin is in low state, data
transfer can take place. When CS is in high state, any signals at the SCLK and SI pins are ignored and SO is
forced into a high impedance state.
CS High to Low transition:
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Data Sheet
The information which is stored in the internal diagnosis register is transferred into the shift register.
SO changes from high impedance state to high or low state depending on the logic OR combination between
the transmission error flag (TER) and the signal level at pin SI. The transmission error flag is set after any kind
of reset, so a reset between two SPI commands is indicated. For details, please refer to
information stays available till the first rising edge of SCLK.
SCLK
SO
CS
SI
Serial Peripheral Interface (SPI)
Serial peripheral Interface
SPI Signal Description
MSB
MSB
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Section
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12
8.3. It is reset to the default values after programming the device into
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08
08
07
07
Smart 8-Channel Low Side Switch
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Serial Peripheral Interface (SPI)
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03
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02
Rev. 1.0, 2011-03-23
Figure
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01
TLE 8108 EM
SPI interface.vsd
LSB
LSB
11. This
t