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TLE8262E Datasheet(PDF) 24 Page - Infineon Technologies AG

Part # TLE8262E
Description  Universal System Basis Chip HERMES Rev. 1.0
PDF  93 Pages
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Manufacturer  INFINEON [Infineon Technologies AG]
Direct Link  http://www.infineon.com
Logo INFINEON - Infineon Technologies AG

TLE8262E Datasheet(HTML) 24 Page - Infineon Technologies AG

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Data Sheet
24
Rev. 1.0, 2009-03-31
TLE8262E
External Voltage Regulator
7
External Voltage Regulator
7.1
Block Description
V
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:
V
S, Vcc3base, Vcc3shunt and Vcc3ref. One transistor is tested
during production. An input voltage up to
V
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
V
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
V
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
V
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
V
cc3
INIT Mode
OFF
Normal Mode
ON
OFF
Sleep Mode
OFF
Restart Mode
Unchanged
SW Flash Mode
ON
OFF
Stop Mode
ON
OFF
Fail-Safe Mode
OFF
RBE
VS-VCC3shunt>
Vshunt_threshold
VREF
State machine
+
-
External voltage diagram .vsd
ICC3base
Vcc 3ref
Vcc 3base
Vcc3shunt
VS



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