TDA5225 Datasheet, PDF (42/176 Pages) Infineon Technologies AG – Enhanced Sensitivity Multi-Channel Quad-Configuration Receiver

TDA5225
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)
Internal Reset
Voltage at PP2 Pin
(NINT Signal)
3V
Reset- / Brownout-
Threshold (typ . 2.45V)
Functional -
Threshold (typ . 2V)
t
t_{R eset}
Supply voltage falls below
Reset- / Brownout-Threshold
Level on
NINT signal
is undefined
Supply voltage
falls below
F u n ctio n a-l T h resh o ld
A ‚LOW’ is generated
at NINT signal
A ‚LOW’ is
generated at
PP2 pin
(NINT signal)
Supply voltage
rises above
F u n ct io n a-lT h resh o ld
A ‚HIGH’ is
generated at
PP2 pin
(NINT signal)
A ‚LOW’ is
generated at
PP2 pin
(NINT signal)
t
µC reads
In t erru p t-
St at u s- R eg ist er
Figure 21 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
42
V1.0, 2010-02-19