Features: · High-precision output voltage: 5.0 V ± 1.5%
· The WDT supports both frequency and duty detection schemes.
· High-precision power supply monitoring function: 4.625 V ± 0.125 V
· Built-in OUTE function
· All functions can be adjusted with external resistors and/or capacitors.
Application· 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 (4.63 V, Typ) or the STBY detection voltage (3.0 V 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 HA16129AFPJ incorporates both Vout overvoltage prevention and short detection functions.
Note: 1. OUTE function: OUTE is an abbreviation for output enable.
Pinout
Specifications
|
Item |
Symbol |
Rating |
Unit |
| Power supply voltage |
VCC |
40 |
V |
| CS pin voltage |
VCS |
VCC |
V |
| CONT pin current |
Icont |
20 |
mA |
| CONT pin voltage |
Vcont |
VCC |
V |
| Vout pin voltage |
Vout |
12 |
V |
| P-RUN pin voltage |
VPRUN |
Vout |
V |
| NMIsns pin voltage |
VNMIsns |
VCC |
V |
| NMI pin voltage |
VNMI |
Vout |
V |
| STBY pin voltage |
VSTBY |
Vout |
V |
| RES pin voltage |
VRES |
Vout |
V |
| OUTE pin voltage |
VOUTE |
Vout |
V |
| Power dissipation*1 |
PT |
400 |
mW |
| Operating temperature |
Topr |
-40 to +85 |
|
| Storage temperature |
Tstg |
-50 to +125 |
|
Note: 1. This is the allowable value when mounted on a 40 * 40 * 1.6 mm glass-epoxy printed circuit board with a mounting density of 10% at ambient temperatures up to Ta = 77. This value must be derated by 8.3 mW/ above that temperature.
DescriptionThe HA16129AFPJ is a watchdog timer IC that monitors a microprocessor for runaway. In addition to the watchdog timer function, the HA16129AFPJ 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.
HA16129AFPJ Data Sheet
