TLE8262E datasheet(24/93 Pages) INFINEON

24 / 93 page

Data Sheet

Rev. 1.0, 2009-03-31

TLE8262E

External Voltage Regulator

7.1

Block Description

cc3 is activated via SPI. The external voltage regulator circuitry is designed to drive an external PNP transistor to

increase output current flexibility. Four pins are used:

S, Vcc3base, Vcc3shunt and Vcc3ref. One transistor is tested

during production. An input voltage up to

SMAX is regulated to VQ,nom = 5.0 V with a precision of ±4%. The output

current of the transistor is monitored via an external shunt resistor.

The state of Vcc3 is reported in the diagnostic

SPI register. When battery voltage is below the minimum operating battery voltage

s < VVextUV, the external

voltage regulator switches off. Figure 7 shows the behavior during this phase. The shunt is used for overcurrent

limitation. If this feature is not needed, connect pins

cc3shunt and Vs together.

Since the junction temperature of the external PNP transistor cannot be read, it cannot be protected against over

temperature by the SBC, and so the thermal behavior has to be checked by the application.

Figure 6

Functional Block Diagram

7.2

External Voltage Regulator Mode

It is possible to turn the

cc3 ON or OFF via SPI command, depending on the SBC modes. Table 4 identifies the

possible states, based on the different SBC modes.

7.3

External Voltage Regulator State by SBC Mode

Table 4 shows the possible states of the Vcc3 external voltage regulator as a function of the SBC mode.

Table 4

External Voltage Regulator State by SBC Mode

SBC Mode

cc3

INIT Mode

OFF

Normal Mode

OFF

Sleep Mode

OFF

Restart Mode

Unchanged

SW Flash Mode

OFF

Stop Mode

OFF

Fail-Safe Mode

OFF

RBE

VS-VCC3shunt>

Vshunt_threshold

VREF

State machine

External voltage diagram .vsd

ICC3base

Vcc 3ref

Vcc 3base

Vcc3shunt

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