tda5225 Infineon Technologies Corporation, tda5225 Datasheet - Page 42

• Manufacturer Part Number: tda5225
• Description: Enhanced Sensitivity Multi-channel Quad-conf Igurat Ion Receiver With Digital Slicer
• Manufacturer: Infineon Technologies Corporation

2.4.9.2
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.
Figure 21
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
Threshold (typ . 2.45V)
Threshold (typ . 2.45V)
Voltage at PP2 Pin
Threshold (typ . 2V)
Threshold (typ . 2V)
Reset- / Brownout-
Reset- / Brownout-
Supply Voltage
Internal Reset
(NINT Signal)
at VDDD Pin
Reset- / Brownout-Threshold
Functional -
Functional -
Supply voltage falls below
Chip Reset
Reset Behavior
3V
3V
A ‚LOW’ is generated
at NINT signal
Supply voltage
falls below
Functional - Threshold
Level on
NINT signal
is undefined
42
Supply voltage
rises above
Functional - Threshold
A ‚LOW’ is
generated at
PP2 pin
(NINT signal)
t
R eset
A ‚HIGH’ is
generated at
PP2 pin
(NINT signal)
Functional Description
A ‚LOW’ is
generated at
PP2 pin
(NINT signal)
V1.0, 2010-02-19
TDA5225
µC reads
Interrupt-
Status-Register
t
t