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HA16117F PDF даташит

Спецификация HA16117F изготовлена ​​​​«Hitachi Semiconductor» и имеет функцию, называемую «CMOS Watchdog Timer».

Детали детали

Номер произв HA16117F
Описание CMOS Watchdog Timer
Производители Hitachi Semiconductor
логотип Hitachi Semiconductor логотип 

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HA16117F Даташит, Описание, Даташиты
HA16117F Series
CMOS Watchdog Timer
Description
The HA16117F Series of ICs make a micro-processor (MPU) system fail-safe by monitoring its power
supply to detect voltage drops, and monitoring a P-RUN (program running) pulse to detect system crashes.
Also referred to as watchdog timers, these devices are essential in systems that aim for high levels of crash
protection. Fabricated by a CMOS process, they consume little power and are ideally suited for battery-
operated systems.
These ICs are available in versions for industrial and communications equipment and automotive
applications, as well as for consumer products.
Functions
Power-on reset
Sends a RES signal to the MPU for a fixed time at power-on
Watchdog timer (WDT)
Monitors a P-RUN signal from the MPU and sends the MPU a RES signal if P-RUN departs from a
set frequency range
Auto-reset
Outputs RES signals to the MPU at clocked intervals while P-RUN remains abnormal
Supply voltage supervision
Outputs a low RES signal if the supply voltage (same as the MPU's VCC) falls below a low threshold
level (VTL). The threshold differs for different ICs in the series, allowing designers to choose an IC
matching system requirements (see ordering information)
Features
Low power consumption : Operating (ACC pin low) = 0.5 mW (Typ)
: Standby (ACC pin high) = 0.2 mW (Typ)
Watchdog timer on/off control by ACC input signal
Independent auto-reset high and low times (tRH and tRL)
Watchdog monitoring by frequency filtering (independent of duty cycle)
High-precision low voltage detection (±2%)
Space- and weight-saving 8-pin SOP package









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HA16117F Даташит, Описание, Даташиты
HA16117F Series
Ordering Information
The HA16117F Series includes three ICs with different low threshold levels (VTL).
Type No.
HA16117FPA/FPAJ
HA16117FPB/FPBJ
HA16117FPC/FPCJ
Low Threshold Voltage (VTL)
4.4 V Typ
4.2 V Typ
4.0 V Typ
Pin Arrangement
VCC
P-RUN
CF
CR
1
2
3
4
8 Tadj
7 ACC
6 GND
5 RES
(Top view)
Pin Description
Pin No.
Symbol
Function
1 VCC Power supply voltage input
2
P-RUN
Watchdog timer (WDT) input
3 CF Connected capacitor CF determines WDT filter characteristic
(normal frequency range)
4 CR Connected capacitor CR determines tON for power-on reset and tOFF, tRH,
and tRL for auto-reset
5
RES
Reset signal output from WDT and voltage supervision circuits
6
GND
Ground
7
ACC
WDT on/off control input (on when ACC is low)
8
Tadj *
For adjusting tRH and tOFF (divide VCC to get the adjustment voltage)
Note: The low-voltage threshold cannot be modified by changing the external resistors connected to the
Tadj pin.
2









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HA16117F Даташит, Описание, Даташиты
Block Diagram
HA16117F Series
1
5V
VCC
2.52 (117FA)
2.36 (117FB) Low voltage detector
GND
6
2.20 (117FC)
1+
1.25 V
COMP.
GND
0.1 µ
4 CR
Power-on and auto-reset circuit
(*I1 < I2)
I2 adjustment
SW2
I2
I1
SW1
+
COMP.
RES
5
to Micro-
computer
R1
510 k
R2
750 k
Tadj
8
(SW1 and SW2 are active high)
Watchdog timer
Watchdog filter (f-duty converter)
P-RUN
2
1/2 frequency W.D in
divider
W.D out
duty (%)
n
Normal range
duty 50%
fL/2 fH/2
W.D in frequency (Hz)
W.D out
duty n%
PULSE from I/O port
3 CF
0.01 µ
Mode
Operating
Standby
ACC Voltage
Low
High
Function
Low voltage detection and WDT
Low voltage detection
Note: The power-on reset circuit operates in both operating and standby modes.
ACC
7
Operating: "Low"
Standby: "High"
The HA16117F consists of a low voltage detector, power-on and auto-reset circuit, and watchdog timer.
Low Voltage Detector
Uses a reference voltage source (1.25 V) and high-precision comparator to detect drops in the supply
voltage.
Power-On and Auto-Reset Circuit
Generates the RES waveform, using a multivibrator consisting of a current source I1 that charges the
external capacitor CR, a current source I2 that discharges CR, and a comparator.
3










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