TDA5235
Functional Description
2.4.9.2 Chip Reset
Power down and power on are controlled by the P_ON pin. A LOW at this pin keeps the
IC in Power Down Mode. All voltage regulators and the internal biasing are switched off.
A high transition at P_ON pin activates the appropriate voltage regulators and the
internal biasing of the chip. A power up reset is generated at the same time.
Supply Voltage
at VDDD Pin
3V
Reset- / Brownout-
Threshold (typ. 2.45V)
Functional-
Threshold (typ. 2V)
t
tReset
Internal Reset
Voltage at PP2 Pin
(NINT Signal)
3V
Reset- / Brownout-
Threshold (typ. 2.45V)
Functional-
Threshold (typ. 2V)
A ‚LOW’ is
generated at
PP2 pin
(NINT signal)
Level on
NINT signal
is undefined
t
µC reads
Interrupt-
A ‚HIGH’ is
generated at
PP2 pin
Supply voltage
falls below
Functional-Threshold
Status-Register
Supplyvoltage falls below
Reset- / Brownout-Threshold
(NINT signal)
A ‚LOW’ is
generated at
PP2 pin
Supplyvoltage
rises above
Functional-Threshold
A ‚LOW’ is generated
at NINT signal
(NINTsignal)
Figure 43
Reset Behavior
A second source that can trigger a reset is a brownout event. Whenever the integrated
brownout detector measures a voltage drop below the brownout threshold on the digital
Data Sheet
72
V1.0, 2010-02-19
INFINEON [ Infineon ]
