TLE8201R datasheet(31/45 Pages) INFINEON

31 / 45 page

TLE 8201R

Data Sheet Rev. 2.0

2006-06-07

4.5

Power-Output 7 (Mirror heater driver)

Output 7 is a high-side switch intended to drive ohmic loads like the heater of an exterior

mirror.

4.5.1

Protection and Diagnosis

4.5.1.1

Short Circuit of Output to Ground

If the high-side switch is turned on and the current rises above the shutdown threshold

SD for longer than the shutdown delay time tdSD, the output transistor is turned off and

the corresponding diagnosis bit is set. During the delay time, the current is limited to

as shown in Figure 13.

Figure 13

Short circuit protection

The output stage stays off and the error bit set until a status register reset is sent to the

SPI or a power-on reset is performed.

4.5.1.2

Open Load

For the high-side switches, an open-load in OFF-state scheme is used as shown in

Figure 14. The output is pulled up by a current source

OpL. In OFF-state, the output

voltage is monitored and compared to the threshold

OpL. If the voltage rises above this

threshold, the open-load signal is set to high. This is equivalent to comparing the load

resistance to the value

OpL / IOpL. The open load error bit is latched and can be reset

by the SPI status register reset or by a power-on reset.

The pull-up current can be switched on and off by the OpLxON bits. This bit should be

set to LOW (i.e. pull-up current switched off) if an output is used to drive LEDs because

they may emit light if biased with the pull-up current.

tdSD

ISC

ISD

OUT

OUT7

short toGND

TLE8201R データシート(PDF) 31 Page - Infineon Technologies AG

TLE8201R データシート(HTML) 31 Page - Infineon Technologies AG

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45

データシートダウンロード