Hitachi HA16113FPJ Dual watchdog timer Datasheet

HA16113FPJ
Dual Watchdog Timers
The HA16113FPJ is a multifunction device that provides microprocessor systems with the necessary
regulated power supply, monitors the supply voltage, and generates power-on reset and watchdog reset
signals. It is ideally suited for battery-operated systems such as instrumentation systems.
Functions
•
•
•
•
•
Regulated power supply
Power-on reset
Two built-in auto-reset circuits
Two built-in watchdog timer circuits (WDT)
Output voltage monitoring (LVI)
Features
•
•
•
•
Simultaneous or independent control of auto-reset outputs.
Precisely regulated output voltage and accurate NMI trigger voltage (both ±2%).
Low-voltage control with NMI, simultaneous RES1 and RES2, and STBY outputs.
Independently selectable durations for power-on reset and auto-reset: power-on duration is common to
both reset outputs; auto-reset durations can be selected independently.
• Reset command input pin (CONT) for second reset output (RES2).
• WDT filter function detects minimum pulse width and maximum period of P-RUN input pulses.
HA16113FPJ
Pin Arrangement
P-RUN1
1
24
P-RUN2
Cf1
2
23
Cf2
Rf
3
22
RR
CR1
4
21
CR2
STBYadj
5
20
SW
STBY
6
19
CONT
RES1
7
18
RES2
NMI
8
17
CRES
NMIadj
9
16
VOUT
Re1
10
15
VCONT
Re2
11
14
CS
GND
12
13
VCC
(Top view)
Pin Description
Pin No. Symbol
Function
1
P-RUN1
Input from main CPU to watchdog timer 1 (WDT1)
2
Cf1
For connecting capacitor Cf1 to determine WDT1 filter characteristic (frequency band)
3
Rf
For connecting common bias resistor Rf to determine WDT1 and WDT2 filter
characteristics (frequency band), power-on reset time (t on , common to RES1 and
RES2), clock-off time of auto-reset circuits 1 and 2, reset high time (tRH1 and t RH2),reset
low time (tRL1 and t RL2), and reset pulse delay at voltage drop and recovery. Use the
resistor value from 100 kΩ to 500 kΩ.
4
CR1
For connecting capacitor C R1 to determine ton for power-on reset and toff1, tRH1, and tRL1
of auto-reset circuit 1.
5
STBY adj
For adjusting standby trigger voltage (insert a resistor between this pin and ground)
Recommended range: V H2 = 2.8 to 4.0 V
6
STBY
Standby signal output
7
RES1
Reset signal output to main CPU
8
NMI
Low-voltage interrupt signal output for memory backup
2
HA16113FPJ
Pin Description (cont)
Pin No. Symbol
Function
9
NMI adj
For fine adjustment of Vout trigger level for NMI signal (insert a resistor between this
pin and Vout or ground)
Recommended range: V H1 = 4.4 to 5.2 V
10
Re1
For connecting resistor Re1 to determine voltage Vout for microprocessor and IC
internal circuits (insert between this pin and Re2)
11
Re2
For connecting resistor Re2 to determine voltage Vout for microprocessor and IC
internal circuits (insert between this pin and ground)
12
GND
Ground
13
VCC
Power supply input pin (operating range: 6 to 40 V)
14
CS
Input for detecting power supply current
15
VC
For base control of external pnp transistor
16
Vout
Regulated voltage supplied to microprocessor and IC internal circuits Connect to
collector of external pnp transistor
17
CRES
Determines reset pulse delay at voltage drop and recovery. NMI output goes low as
soon as Vout drops below NMI trigger level. If Vout remains below this level for time
t RES, both reset outputs also go low. When Vout recovers above NMI trigger level, first
NMI output goes high, then after time tr both reset outputs also go high. Times tRES and
t r are adjusted by capacitor CRES inserted between this pin and ground.
18
RES2
Reset signal output to sub CPU
19
CONT
Input pin for resetting sub CPU on command, or when sub CPU crashes Low input at
CONT causes low output at RES2
20
SW
Selects simultaneous control, in which main and sub CPUs are both reset when main
CPU crashes, or independent control, in which sub CPU is reset independently of
main CPU
Open—independent control; connected to ground—simultaneous control
21
CR2
For connecting capacitor C R2 to determine toff2, tRH2, and tRL2 of auto-reset circuit 2
22
RR
For connecting bias resistor R R to determine t off1, toff2, tRH1, t RH2, t RL1, and tRL2. Use the
resistor value from 100 kΩ to 500 kΩ.
23
Cf2
For connecting capacitor Cf2 to determine WDT2 filter characteristic (frequency band)
24
P-RUN2
Input from sub CPU to watchdog timer 2 (WDT2)
3
HA16113FPJ
Block Diagram
16 VOUT
STBYdetection
block
71 k
—
31.2 k
+
STBY
adj
NMI
adj
Over
voltage
detection
block
3.3 k
5
36.8 k
69.7k
15 VCONT 14 CS
NMI detection
2 k block
80 k
—
13 VCC
Detection
block
—
3.3 k
+
Reference
voltage
circuit
+
9
Regulator block
25 k
CR1
Re1
10
Re2
11
8 NMI
4
6 STBY
2
19 k
I
19*I
Auto-reset circuit 1
8.4 k
Cf1
I/6
1
P-RUN1
CRES
33 k
—
+
17
Delay circuit block
21
20
+
—
SW
Auto-reset circuit 2
P-RUN2 24
Cf2
I1
3.3 k
I2
23
12
GND
RES1
7
20 k
I*4/3
CR2
4
3.3 k
+
—
Rf
3
22
RR
19
CONT
RES2
18
HA16113FPJ
Timing Waveforms
VBATT
4.7 V
4.6 V (VNMI)
4.6 V
4.5 V
Vout
4.7 V
3.0 V (VSTBY)
NMI
STBY
P-RUN1
Crash
Crash
P-RUN2
RES1
ton
CONT
RES2
tOFF1
tRL1
ton
tOFF1
tRES
tr
tRH1
tRES
tr
tOFF2
Note: SW pin is connected to ground.
5
HA16113FPJ
Absolute Maximum Ratings (Ta = 25°C)
Item
Symbol
Value
Unit
VCC power supply voltage
VCC
40
V
CS voltage
VCS
40
V
Control pin voltage
VC
40
V
Control pin current
IC
20
mA
Vout voltage
Vout
10
V
P-RUN voltage
VPRUN
Vout
V
SW voltage
VSW
Vout
V
CONT voltage
VCONT
Vout
V
RES current
I RES
5
mA
NMI current
I NMI
5
mA
I STBY
5
mA
PT
600
mW
Operating temperature
Topr
–40 to +85
°C
Storage temperature
Tstg
–50 to +125
°C
STBY current
Power dissipation
Note
Note: At ambient temperatures up to Ta = 60°C. Derated by 9.8 mW/°C above this point.
6
HA16113FPJ
Electrical Characteristics (Ta = 25°C, Rf = 180 k , Cf1 = Cf2 = 0.01 µF, C R1 = CR2 = 0.1 µF)
Item
Symbol
Min
Typ
Max
Unit
10
15
mA
Test Conditions
Chip
Power supply current
I CC
—
Regulator
Output voltage
Vo1
4.875 5.00
5.125 V
VCC = 6 to 17.5 V
VC current = 5 mA
Vo2
4.80
5.00
5.20
V
VCC = 6 to 17.5 V
VC current = 10 mA
Stability with respect to line Voline
voltage
–50
—
50
mV
VCC = 6 to 17.5 V
VC current = 10 mA
Stability with respect to
load current
Voload
–100 —
100
mV
VC current = 0.1 to 15
mA
Ripple rejection
RREJ
45
75
—
dB
Vi = 0.5 Vrms
fi = 1 kHz
Short-circuit detection
voltage
Vos
0.08
0.14
0.20
V
Temperature coefficient of output voltage
σVo/σT
—
–40
—
ppm/
°C
Maximum adjustable
output voltage
Vomax
—
—
7.0
V
Low input voltage
VIL1, 2
—
—
0.8
V
High input voltage
VIH1, 2
2.0
—
—
V
High input current
I IH1, 2
—
0.3
0.5
mA
Power-on time
t on
25
40
60
ms
Clock-off time (1)
t off1
80
130
190
ms
RR: open
Reset low time (1)
t RL1
15
20
30
ms
RR: open
Reset high time (1)
t RH1
40
60
90
ms
RR: open
Clock-off time (2)
t off2
25
40
60
ms
RR: = 75 kΩ
Reset low time (2)
t RL2
4
6
9
ms
RR: = 75 kΩ
Reset high time (2)
t RH2
15
20
30
ms
RR: = 75 kΩ
NMI trigger voltage
VNMI
4.45
4.60
4.75
V
Hysteresis width of above
VHYSN
25
50
100
mV
STBY trigger voltage
VSTBY
2.70
3.00
3.30
V
Hysteresis width of above
VHYSS
1.35
1.50
1.65
V
RES pulse
delay time
Drop
t RES
—
200
—
µs
CRES = 1500 pF
Recovery
tr
—
200
—
µs
CRES = 1500 pF
P-RUN1/2
input section
Watchdog
section (both
RES1 and
RES2 outputs)
LVI section
VIH = VOL
7
HA16113FPJ
Electrical Characteristics (Ta = 25°C, Rf = 180 k , Cf1 = Cf2 = 0.01 µF, C R1 = CR2 = 0.1 µF) (cont)
Item
NMI output
section
STBY output
section
RES1/2 output
section
CONT and SW
input section
LVI section
8
Symbol
Min
Typ
Max
Unit
Test Conditions
NMI low voltage
VOL1
—
—
0.4
V
I OL1 = 2 mA
NMI high voltage
VOH1
—
VO1
—
V
NMI function initial voltage VSTN
—
0.7
1.0
V
STBY low voltage
VOL2
—
—
0.4
V
STBY high voltage
VOH2
—
VO1
—
V
STBY function initial
voltage
VSTS
—
0.7
1.0
V
RES1/2 low voltage
VOL3
—
—
0.4
V
RES1/2 high voltage
VOH3
—
VO1
—
V
RES1/2 function initial
voltage
VSTR
—
0.7
1.0
V
Low input voltage
VIL3
—
—
0.8
V
High input voltage
VIH3
2.0
—
—
V
Low input current
I IL3
–120 –60
—
µA
VIL3 = 0 V
High input current
I IH3
—
0.3
0.5
mA
VIH3 = VOL
Temperature coefficient of
NMI trigger voltage
δVH1/δT
—
100
—
ppm/
°C
Temperature coefficient of
STBY trigger voltage
δVH2/δT
—
200
—
ppm/
°C
I OL2 = 2 mA
I OL3, 4 = 2 mA
HA16113FPJ
External Circuit Constant Calculations
Equations for the various functions are given below. CR1 and Cf1 are for RES1. C R2 and Cf2 are for RES2. (Values
given in equations are for reference.)
Item
Equation
Remarks
Vout = 0.388 ×
If the desired Vout is 5 V
± 2.5%, recommended
values are Re1 = 1.5 kΩ
and Re2 = 9.1 kΩ
Regulated
output voltage
Re2
+ 2.63
Re1
Vout
HA16113FPJ
Re1
Short-circuit
detection
voltage
VCS < Iout × RCS
When this function
operates, VCONT stops
drawing current from the
base of the external
transistor, so Vout output
stops
Maximum
Vout Max < 7.0 V
output voltage
t RH, t RL (for
both RES1
and RES2)
t RH = 3.2 × CR × R’
t RL = 1.1 × CR × R’
Re2
Iout
R CS
V CC
Re1
C S V C Vout
Re2
Prevents microprocessor damage that would result if
the output voltage were raised too high by mistake.
The maximum output voltage is fixed.
R’ =
t ON (for both
RES1 and
RES2)
t ON = 2.2 × CR × Rf
t OFF (for both
RES1 and
RES2)
tOFF = 6.1 × C R × R’ R’ =
1
1
1
+
Rf
RR
1
1
1
+
Rf
RR
Determines the
frequency and duty cycle
of the reset pulse
RES
Sets the time from the
rise of Vout to the
clearing of RES output
Vout
Sets the time from when
P-RUN pulses stop until
the reset pulse is output
P-RUN
tRL
tRH
tON
RES
tOFF
RES
tr, tRES (for
both RES1
and RES2)
GND
t r = 0.75 × CRES × Rf
t RES = 0.625 × CRES × Rf
tr sets the time from the rise of NMI to the rise of
RES, when Vout drops by more than the STBY trigger
voltage, then recovers. tRES is the time from the fall of
NMI to the fall of RES.
4.65 V (typ)
Vout
4.6 V (typ)
NMI
RES
tr
tRES
9
HA16113FPJ
External Circuit Constant Calculations (cont)
Item
Equation
Remarks
VNMI
V NMI = 1.2 × 1 +
(R1 // 71.7)
(R2 // 25)
NMI recovery voltage
(V NMI high) is:
V NMI high =
86.65
86.65
+
+ 1.2
R2 // 25
R1
73.8
1+
R1
Voltage at which the NMI signal is output when Vout
drops. The NMI trigger voltage and NMI recovery voltage
can be trimmed by connecting resistors between the
NMIadj pin and Vout (R1), and between NMIadj and GND
(R2).
VNMI high
Vout
Vout
R1
NMIadj
R2
NMI
VNMI
NMI
(R1 and R2 are in kΩ )
VSTBY
V STBY =
71
1.47× 1 +
31.2 + (36.8 // R3)
t
Voltage at which the STBY signal is output when Vout
drops. The STBY trigger voltage can be adjusted by
connecting a resistor (R3) between the STBYadj pin and
GND. The STBY recovery voltage cannot be adjusted.
VSTBY high
Vout
Vout
VSTBY
STBY
STBYadj
STBY
R3
t
(R3 is in kΩ )
WDT.
Line1 =
0.31 × (Du – 24)
Cf × Rf
Line2 = Du (= 25%)*
Line3 =
0.015
Cf × Rf
Line4 =
1 – Du
2.1 × tRH
The watchdog timer function determines whether the PRUN pulse is normal or not. A reset pulse is output if PRUN is determined to be abnormal. The normal region is
the part bounded by Line1 to Line3 (or Line4) in the
diagram. Line4 applies in certain cases, depending on
CR, Cf, and the state of P-RUN.
(Hz)
Line1
Line5 = 99% *
Du is the duty cycle of the P-RUN
pulse.
t RH
Du =
t RL + t RH
Normal area
Frequency
Line2
Line3
Note: Line2 and Line5 are fixed.
Line5
Line4
Duty
10
(%)
HA16113FPJ
Operating Interconnections (example)
VCC
RES
STBY
MAIN
CPU
NMI
PORT
GND
Re2
Re1
NMI
adj
NMI RES1 STBY STBY CR1
adj
Rf
Cf1 P-RUN1
RR
Cf2 P-RUN2
PORT
HA16113
VCC
CS
VC
Vout CRES RES2 CONT SW
CR2
SYSTEM
VCC
PORT VCC
Batt.
NMI
SUB
CPU
STBY
RES
11
HA16113FPJ
Characteristic Curves
Watchdog timer characteristic
10 k
1k
Normal area
P-RUN1
P-RUN2
100
R F CR C F
0.01 µF
180 kΩ 0.1 µF
Test circuit
10
0
20
40
60
80 100 (%)
Vout characteristic
5.4
5.3
Re1 = 1 kΩ
Re1 = 1.5 kΩ
Re1 = 2 kΩ
5.2
5.1
Regulated
output
voltage (V)
5.0
ICONT
4.9
5 mA
4.8
VCC VCONT VOUT
4.7
HA16113FPJ
4
6
8
10
Re2 resistance (kΩ )
12
12
14
RL
Re1
Re2
16
HA16113FPJ
ton characteristic
Vary the external capacitance (CR) and
resistance (Rf) that determine the ton time
and measure the variation in ton.
(Same for RES1 and RES2)
Cf = 0.22 µF
140
12 V
120
RES1, RES2
CR1, CR2
Rf NMI
100
Measure with
oscilloscope
ton (ms) 80
60
Cf = 0.1 µF
40
Cf = 0.047 µF
20
0
60
100
140
180
220
260
Rf resistance (k Ω)
toff characteristic
400
Vary the external capacitance (CR) and
resistance (Rf) and measure the variation
in toff . (Same for RES1 and RES2)
RES1
RES2
300
CR = 0.22 µF
toff (ms) 200
CR = 0.1 µF
100
CR = 0.047 µF
0
60
100
140
180
220
260
Rf resistance (k Ω)
13
HA16113FPJ
t RL characteristic
60
Vary the external capacitance (CR) and
resistance (Rf) and measure the variation
in t RL . (Same for RES1 and RES2)
RES1
RES2
CR = 0.22 µF
40
t RL (ms)
CR = 0.1 µF
20
CR = 0.047 µF
0
60
100
140
180
220
260
Rf resistance (kΩ )
t RH characteristic
180
140
t RH (ms)
RES1
RES2
Vary the external capacitance (CR) and
resistance (Rf) and measure the variation
in t RH. (Same for RES1 and RES2)
C R = 0.22 µF
100
60
C R = 0.1 µF
20
C R = 0.047 µF
60
100
140
180
Rf resistance (kΩ )
14
220
260
HA16113FPJ
tr characteristic (for both RES1 and RES2)
800
12 V
600
tr (µs)
CRES R
f
RES2
NMI
Measure with
oscilloscope
CRES = 740 pF
400
CRES = 1500 pF
200
CRES = 3300 pF
0
60
100
140
180
220
260
Rf resistance (k Ω)
t RES characteristic (for both RES1 and RES2)
600
12 V
500
CRES R f
400
t RES (µs)
RES2
NMI
Measure with
oscilloscope
CRES = 740 pF
300
CRES = 1500 pF
200
CRES = 3300 pF
100
0
60
100
140
180
220
260
Rf resistance (k Ω)
15
HA16113FPJ
Precautions
If the IC’s ground potential varies suddenly by several volts due to wiring impedance (see figure 7), a false
RES pulse may be output. The reason for this is that potentials in the RES pulse generating circuit change
together with the Vout-GND potential. The reference potential of the comparator in figure 8 and the
potential of the external capacitor have different impedances as seen from the comparator, causing a
momentary inversion. The solution is to stabilize the ground potential. Two ways of stabilizing the IC’s
ground line are:
• Separate the IC’s ground line from high-current ground lines.
• Increase the capacitance (Co) used to smooth the Vout output.
Wiring impedance
SW2
SW1
HA16113FPJ
Co
RL
VIGN
Relay or other load
Wiring impedance
Figure 1 Typical Circuit
Vout
VCC Vcont
Wiring impedance
RES
C RES
+
–
GND
Figure 2 RES Comparator
16
HA16113FPJ
Package Dimensions
Unit: mm
15.8
16.2 Max
13
12
1.12 Max
*0.17 ± 0.05
0.15 ± 0.04
1
2.50 Max
8.4
24
11.8 ± 0.3
1.7
0.15
*0.40 ± 0.08
0.38 ± 0.06
0.20 M
*Dimension including the plating thickness
Base material dimension
0.20 ± 0.10
0° – 8°
1.27
1.0 ± 0.2
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
FP-24D
Conforms
—
0.6 g
17
HA16113FPJ
Cautions
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copyright, trademark, or other intellectual property rights for information contained in this document.
Hitachi bears no responsibility for problems that may arise with third party’s rights, including
intellectual property rights, in connection with use of the information contained in this document.
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received the latest product standards or specifications before final design, purchase or use.
3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However,
contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
consequential damage due to operation of the Hitachi product.
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7. Contact Hitachi’s sales office for any questions regarding this document or Hitachi semiconductor
products.
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18
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