TLE6236G Datasheet, PDF (9/15 Pages) Infineon Technologies AG – Smart Octal Low-Side Switch

Datasheet TLE 6236 G
SO - Serial Output. Diagnostic data bits are shifted out serially at this pin, the most significant
bit first. SO is in a high impedance state until the CS pin goes to a logic low state. New diag-
nostic data will appear at the SO pin following the rising edge of SCLK.
RESET - Reset pin. If the reset pin is in a logic low state, it clears the SPI shift register and
switches all outputs OFF. An internal pull-up structure is provided on chip.
Diagnostics
FAULT - Fault pin. There is a general fault pin (open drain) which shows a high to low transi-
tion as soon as an error occurs for any one of the eight channels. This fault indication can be
used to generate a µC interrupt. Therefore a ‘diagnosis’ interrupt routine need only be called
after this fault indication. This saves processor time compared to a cyclic reading of the SO
information.
As soon as a fault occurs, the fault information is latched into the diagnosis register. Serial
data out pin (SO) is in a high impedance state when CS is high. If CS receives a LOW signal,
all diagnosis bits can be shifted out serially. The rising edge of CS will reset all error registers.
Logic table
Parallel
Input
1
L
2
L
3
H
4
H
5
L
6
L
7
H
8
H
SI Bits
0-7
L
H
L
H
L
H
L
H
SO DIAG- Output State ^{Output voltage}
Bits 0-7
V_OUT
Operating Mode
L
OFF
>Vref
normal function
H
ON
< Vref
normal function
L
ON
< Vref
normal function
H
ON
< Vref
normal function
H
OFF
< Vref
open load/short to gnd
L
ON
>Vref
overload
H
ON
>Vref
overload
L
ON
>Vref
overload
Table 1: Definition of diagnostic bits under parallel and serial control
Basic principle of fault detection:
SO Bit = SI Bit:
SO Bit inverse to SI Bit :
Normal Function
Fault Condition
The diagnostic bits DIAG0 to DIAG3 for channel 1 to 4 indicate a fault when the DIAG bit is
high during parallel control (IN1 .. IN4 = H; serial data bits 0 .. 3 = L). Note that the SPI serial
input (SI) bit overrides the ON state control from IN1 to IN4 regarding diagnostic information.
Compare DIAG Bit in line 3 (parallel ON only) with DIAG Bit in line 4 (serial and parallel ON)
under normal function.
Compare DIAG Bit in line 7 (parallel ON only) with DIAG Bit in line 8 (serial and parallel ON)
under fault condition.
V2.1
Page 9
26.Aug. 2002