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PDF HA16129FPJ Data sheet ( Hoja de datos )
| Número de pieza | HA16129FPJ | |
| Descripción | Single Watchdog Timer | |
| Fabricantes | Hitachi Semiconductor | |
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HA16129FPJ
Single Watchdog Timer
Description
The HA16129FPJ is a watchdog timer IC that monitors a microprocessor for runaway. In addition to the
watchdog timer function, the HA16129FPJ also provides a function for supplying a high-precision
stabilized power supply to the microprocessor, a power on reset function, a power supply voltage
monitoring function, and a fail-safe function that masks the microprocessor outputs if a runaway is
detected.
Functions
• Watchdog timer (WDT) function
Monitors the P-RUN signal output by the microprocessor, and issues an auto-reset (RES) signal if a
microprocessor runaway is detected.
• Stabilized power supply
Provides power to the microprocessor.
• Power on and clock off functions
The power on function outputs a low level signal to the microprocessor for a fixed period when power
is first applied.
The clock off function outputs a RES signal to the microprocessor a fixed period after a runaway
occurs.
• Power supply monitoring function
When the reference voltage (Vout) falls and becomes lower than the NMI detection voltage (4.63V,
Typ) or the STBY detection voltage (3.0V Typ), this function outputs either an NMI signal or an STBY
signal, respectively. Note that NMI detection can be set to monitor either VCC or Vout.
• OUTE function*1 (fail-safe function)
Outputs a signal used to mask microprocessor outputs when a microprocessor runaway has been
detected.
• RES delay function
Sets the delay between the time the NMI signal is output and the time the RES signal is output.
• Protection functions
The HA16129FPJ incorporates both Vout overvoltage prevention and current limiter functions.
Note: 1. OUTE function: OUTE is an abbreviation for output enable.
1 page  
HA16129FPJ
Functional Description
This section describes the functions provided by the HA16129FPJ. See the section on formulas for details
on adjustment methods.
Regulator Block
Vout Voltage
This IC provides a stabilized 5V power supply by controlling the base current of an external transistor. The
largest current (the maximum CONT pin current) that can be drawn by the base of this external transistor is
20mA. Also note that the Vout output is also used for the power supply for this IC’s internal circuits.
Current Limiter Block
When a current detection resistor (RCS) is connected between the VCC pin and the CS pin, and the voltage
between these pins exceeds the VCS voltage (150mV Typ), the CONT pin function turns off and the output
voltage supply is stopped. This function can not work when VOUT < 2V.
Output Voltage (Vout) Adjustment
The output voltage can be adjusted by connecting an external resistor at the output voltage adjustment pin
(Voadj). However, if for some reason the voltage on this Vout line increases and exceeds the voltage
adjustment range (7V Max), the CONT pin function turns off and the output voltage supply is stopped.
Refer to the timing charts in conjunction with the following items.
LVI (Low Voltage Inhibit)
NMI Detection Voltage
This function monitors for drops in the power-supply voltage. This function can be set up to monitor either
VCC or Vout. When Vout is monitored, a low level is output from the NMI pin if that voltage falls under the
detection voltage (4.63V Typ). Then, when the power-supply voltage that fell rises again, the NMI pin will
output a high level. Note that this function has a fixed hysteresis of 50mV (Typ). The monitored power
supply is selected by connecting the NMIsns pin either to the VCC pin or to the VOUT pin. When detecting
VCC, an external adjustment resistor is required.)
The detection voltage can also be adjusted with the NMIadj pin.
STBY Detection Voltage
This function monitors for drops in the Vout voltage. It monitors the Vout voltage, and outputs a low level
from the STBY pin if that voltage drops below the detection voltage (3.0V Typ). Then, when the power-
supply voltage that fell rises again, the STBY pin will output a high level. Note that this function has a
fixed hysteresis of 1.35V (Typ).
The detection voltage can also be adjusted with the STBYadj pin.
5
5 Page 
Timing Charts
Whole system timing chart
VCC
VOUT
VSTBY'
STBY
VNMI
VNMI'
NMI
RES
tON
tRL tRES
tRH
tr
OUTE
P-RUN
tOFF
Microprocessor
runaway
HA16129FPJ
VSTBY
tRES
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet HA16129FPJ.PDF ] | |
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