ha16117fpc Renesas Electronics Corporation., ha16117fpc Datasheet

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ha16117fpc

Manufacturer Part Number
ha16117fpc
Description
Cmos Watchdog Timer
Manufacturer
Renesas Electronics Corporation.
Datasheet

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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
Features
Power-on reset
Watchdog timer (WDT)
Auto-reset
Supply voltage supervision
Low power consumption : Operating (ACC pin low) = 0.5 mW (Typ)
Watchdog timer on/off control by ACC input signal
Independent auto-reset high and low times (t
Watchdog monitoring by frequency filtering (independent of duty cycle)
High-precision low voltage detection ( 2%)
Space- and weight-saving 8-pin SOP package
Sends a RES signal to the MPU for a fixed time at power-on
Outputs RES signals to the MPU at clocked intervals while P-RUN remains abnormal
Outputs a low RES signal if the supply voltage (same as the MPU's V
Monitors a P-RUN signal from the MPU and sends the MPU a RES signal if P-RUN departs from a
set frequency range
level (V
matching system requirements (see ordering information)
TL
). The threshold differs for different ICs in the series, allowing designers to choose an IC
: Standby (ACC pin high) = 0.2 mW (Typ)
HA16117F Series
CMOS Watchdog Timer
RH
and t
RL
)
CC
) falls below a low threshold

Related parts for ha16117fpc

ha16117fpc Summary of contents

Page 1

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 ...

Page 2

... HA16117F Series Ordering Information The HA16117F Series includes three ICs with different low threshold levels (V Type No. HA16117FPA/FPAJ HA16117FPB/FPBJ HA16117FPC/FPCJ Pin Arrangement Pin Description Pin No. Symbol Function 1 V Power supply voltage input CC 2 P-RUN Watchdog timer (WDT) input 3 C Connected capacitor C F (normal frequency range) ...

Page 3

Block Diagram 2.52 (117FA) 2.36 (117FB) 2.20 (117FC) GND 6 1 GND Power-on and auto-reset circuit 0.1 I adjustment 2 (SW1 and SW2 are active high Watchdog timer 510 k ...

Page 4

HA16117F Series Watchdog Timer Reshapes the P-RUN signal (programming-running pulse) from the MPU to obtain a 50% duty cycle, then converts frequency to duty cycle in the watchdog filter (WD filter). The watchdog filter is a bandpass filter. The duty ...

Page 5

... General Operating supply current Standby supply current Low Low voltage HA16117FPA/FPAJ voltage threshold detector level HA16117FPB/FPBJ HA16117FPC/FPCJ Hysteresis width ACC Low input voltage High input voltage P-RUN Low input voltage input High input voltage WDT Power-on reset time Reset-clock off time ...

Page 6

HA16117F Series Timing Waveforms and Functional Description V CC P-RUN Watchdog function on RES (V = "Low") ACC Watchdog function off RES (V = "High") ACC Watchdog On/Off Function A feature of the HA16117F is that watchdog supervision can be ...

Page 7

Internal Operation and Usage Notes Figure 3 shows an equivalent circuit of the watchdog timer block with a V level and the following pages show internal operation timing charts for different P-RUN frequencies. (Descriptions apply to conditions ...

Page 8

HA16117F Series 1. When P-RUN signal is not input The watchdog filter circuit output (WD) is fixed low, so the RES signal is output as shown in the figure below in accordance with power-on and auto-reset circuit C H P-RUN ...

Page 9

With a low-frequency P-RUN signal ( Hz) When Hz, the WD duty (D = 100 P-RUN duty is 25% or above, multivibrator (power-on and auto-reset circuit) oscillation stops. As ...

Page 10

HA16117F Series 3. With a 10 kHz P-RUN signal When kHz, the WD duty (D = 100 P-RUN 25%, the multivibrator (power-on and auto-reset circuit) does not oscillate. The RES signal remains high. H P-RUN L H ...

Page 11

With a 150 kHz P-RUN signal When f is 100 kHz or above, the WD duty (D = 100 P-RUN Therefore discharged, and the RES signal is output at the instant that the pin potential R falls ...

Page 12

HA16117F Series 5. t when P-RUN signal 90 kHz OFF When the P-RUN frequency is high, even though within specification, the C falls. If the P-RUN frequency falls sharply at this time, t With values P-RUN frequency ...

Page 13

When P-RUN frequency fluctuates (1) If there is a double-pulse in P-RUN, the WD filter duty will be decreased and RES will be output, as shown in the figure below, for example. In this case, the condition for non-output ...

Page 14

HA16117F Series 7. When P-RUN frequency fluctuates (2) If there is a double-pulse in P-RUN, RES will not be output as long as the ratio of P-RUN pulse interval minimum value to maximum value less. The timing ...

Page 15

Summary of cases where P-RUN frequency fluctuates If there is a double-pulse in P-RUN, RES may be output if the double-pulse has multiple frequency components. If the P-RUN frequency fluctuates, refer to the following when making the P-RUN setting. ...

Page 16

HA16117F Series Setting of RES Timing and Watchdog Frequency Range Different MPUs have different RES timing requirements. The minimum reset time (t on (rise for some MPUs and 100 ms for others. CC RES ...

Page 17

Selection of External Constants If the reset duration necessary for the MPU to operate reliably at power-on is known, there is a simple procedure for selecting external constants, starting from the power-on reset time (t START Set power-on reset time ...

Page 18

HA16117F Series Operating Characteristics and Test Circuits RES ms/div Power-on reset time 5 V P-RUN RES ms/div Reset-clock ...

Page 19

Low Voltage Threshold vs. Ambient Temperature 5.0 HA16117FA V -Ta TL 4.5 ( 50ppm/ C) 4.0 3 Ambient temperature Threshold Hysteresis Width vs. Ambient Temperature 150 HA16117FA V -Ta HYS 100 ...

Page 20

HA16117F Series Operating Supply Current vs. P-RUN Input Frequency 500 100 10 100 Pulse genelator P-RUN input frequency f (Hz) P-RUN pin Tadj CC 0 ...

Page 21

Standby Supply Current vs. Supply Voltage 200 100 0 5 Supply Voltage V (V) CC Supply Current vs. Ambient Temperature 300 200 100 STBY P-RUN ACC ...

Page 22

HA16117F Series RES Low Voltage vs. RES pin Sink Current 0.4 0.3 0.2 0 RES pin sink current 0.01 1.5 m (A) OL RES Low Voltage vs. Ambient Temperature 0.3 I ...

Page 23

RES High Voltage vs. RES pin Source Current 500 RES pin source current I (A) o source HA16117F Series V Tadj CC 5V P-RUN ACC C GND F C RES R 0.01 ...

Page 24

HA16117F Series Power-on Reset Time vs 100 0.01 0.1 External capacitance C RES Output Timing vs 100 ...

Page 25

High Setup Time vs. C Capacitance R 1000 100 10 1 0.01 0.1 External Capacitance C (F) R Low Setup Time vs. C Capacitance 100 0.01 ...

Page 26

HA16117F Series Reset High Time vs. K (Tadj 100 0.56 0.6 0.7 Tadj constant K Duty-cycle dependence of P-RUN normal frequency range 1 M MPU system abnormal 100 k Abnormal if duty cycle ...

Page 27

P-RUN Input Frequency vs. K (Tadj constant 100 MPU system normal 100 10 MPU system abnormal 1 0.55 0.6 0.7 0.8 ...

Page 28

HA16117F Series P-RUN Low Threshold Frequency vs Normal 100 Abnormal 500 p 1000 p 0.01 External Capacitance C P-RUN Input Frequency vs. ...

Page 29

Power-on Reset Time vs. Ambient Temperature 100 Ambient temperature Power-on Reset Time vs. Ambient Temperature t and t vs. Ambient Temperature RH RL 100 ...

Page 30

HA16117F Series Package Dimensions 4.85 5.25 Max 8 1 0.75 Max 1.27 *0.42 0.08 0.40 0.06 *Dimension including the plating thickness Base material dimension 0.25 6.50 – 0.15 1.05 + 0.25 0.60 – 0.18 0.15 0.12 ...

Page 31

Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi’s or any third party’s patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise ...

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