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M59350FP
Watchdog Timer IC with Built-in 5 V Constant-Voltage Power Supply
REJ03F0016-0100Z Rev.1.00 Aug.25.2003
Description
The M59350FP is an IC developed for use as a watchdog timer with a built-in 5 V constant-voltage power supply. It is provided with functions for power-on reset, constant voltage monitoring, and watchdog timer operation, and can be used as a power supply circuit for various systems. Because it employs a 15-pin flat package, it is ideal for compact system designs.
Features
* * * * * Built-in power-on reset circuit Built-in 5 V constant-voltage power supply Built-in 5 V constant-voltage power supply monitoring circuit Built-in watchdog timer circuit Compact flat package (SOP, 14P2N, 1.27 mm pitch)
Application
* ECU power supply circuit for automotive use * Other automotive applications
System Block Diagram
B COMP VOAd j VO IA d j HA LT
VB
Constantcurrent circuit
RESET VREF Internal rise deray circuit: 400 s Internal fall deray circuit: 10 s Internal fall deray circuit: 200 s
P-RUN
Watchdog circuit (timer reset period) (power-on reset) GND
C1
EN
C2
Rev.1.00, Aug.25.2003, page 1 of 8
M59350FP
Pin Arrangement (top view)
Vo 1 VoAdj 2 14 B 13 VB
M59350FP
IAdj 3 VREF 4
12 GND 11 RESET 10 EN 9 C1 8 P-RUN
C2 5 HALT 6
COMP 7
Package: 14P2 N- A
Pin Description
Pin no. [1] [13] [14] Pin symbol Vo VB B Function By connecting an external PNP transistor, pin [1] (VO): 5 V constant voltage output pin [1] (VO): PNP transistor collector connection pin [13] (VB): PNP transistor emitter + power supply connection pin [14] (B): PNP transistor base connection (pin [1]: grounded via capacitor (100 F)) By connecting a load, adjusts pin [1] (V) constant voltage: 5 V Sets charge/discharge current of capacitors to set time (C1, C2 within IC) Monitors voltage, compares with set voltage to control pin [6] (HALT), pin [11] (RESET) output Delay time from decision that pin [4] (VREF) is "L" until pin [6] (HALT) outputs "L" is set through the grounding capacitance (when open, the IC Built-in capacitance results in a delay time of 10 s) Outputs pin [4] (VREF) voltage monitoring result Pin for connection of constant-voltage power supply (Vo) phase compensation capacitance Detects voltage and period of input clock signal, controls pin [11] (RESET) output Sets the power-on reset time (T3), watchdog time (T2), watchdog reset pulse width (T1) time through the grounding capacitance Halts the watchdog function on input of "L" level (open: H input fixed) Outputs judgment result of pin [4] (VREF) voltage monitoring, pin [8] (P-RUN) input clock signal GND
[2] [3] [4] [5]
VoAdj IAdj VREF C2
[6] [7] [8] [9] [10] [11] [12]
HALT COMP P-RUN C1 EN RESET GND
Rev.1.00, Aug.25.2003, page 2 of 8
M59350FP
Absolute Maximum Ratings
(Unless otherwise specified, Ta = 25C)
Pin no. [13] [13] [14] [6], [11] [6], [11] [8], [10] [8], [10] Symbol VB VB IB VOUT IOUT VIN IIN Pd Topr Tstg Item Power supply voltage Power supply surge voltage Bias current Output voltage Output current Input voltage Input current Power dissipation Operating temperature Storage temperature Test conditions t 200 ms Ratings -0.3 to 36 -0.3 to 36.5 30 -0.3 to 36 10 -0.3 to 16 -2.0 to 2.0 550 -40 to +85 -55 to +125 Unit V V mA V mA V mA mW C C
Ta = 25C
Note: All voltages are relative to the IC GND pin voltage (0 V). All current directions are positive when flowing into the IC (unmarked, or marked with a +), and are negative when flowing out (marked -).
Thermal Reduction Rate Curve (Maximum Rating)
Internal power consumption Pd (mW)
750 550 500
250
0
25
50
75
85
100
125
Ambient temperature Ta (C)
Recommended Operating Conditions
(Unless otherwise specified, Ta=-40 to +85C)
Pin No. [13] [1] [8], [10] [8], [10] Symbol VB VO VIN VOUT Item Power supply voltage Output power supply voltage Input voltage Output voltage Conditions Ratings 6 to 16 4.5 to 5.5 0 to VO 0 to VO Unit V V V V
Rev.1.00, Aug.25.2003, page 3 of 8
M59350FP
Electrical Characteristics
(Unless otherwise specified, Ta=-40 to +85C, Io = 50 mA, Ci = 22 F, Co = 100 F, C1 = 0.47 F, Cc = 4700 pF, RIAdj = 18 k)
Units Symbol IB VO VON Reg-IN Reg-L VREF VTH1 IVREF VsatH VsatR ILHAL ILR VL-EN IL-EN IIN-P VIN-PH VIN-PL T1(RW) T2(RW) T3(R) T4(R) T5(H) T6(H) VB-MIN VO-MIN ID Notes: 1. 2. 3. 4. 5. Item Bias current Output voltage Input stability Load stability Reference voltage Threshold voltage hysteresis VREF input current HALT output saturation voltage RESET output saturation voltage HALT output leakage current RESET output leakage current ENL input voltage ENL input current P-RUN input current P-RUN H input voltage P-RUN L input voltage Watchdog reset pulse width Measurement conditions Note1 Steady-state VoAdj pin grounded Vcc = 7 to 36 V Io = 1 to 500 mA Note2: VTH1 set to 4.35 V IHALT = 5 mA IRESET = 5 mA VHALT = 5 V VRESET = 5 V min. -- 4.75 5.2 -- -- 1.200 20 -- -- -- -- -- typ. 9 5.0 5.5 0.1 40 1.265 50 -- 0.2 0.2 -- -- max. 20 5.25 6.0 0.2 200 1.330 100 10 0.6 0.6 10 10 Unit mA V V %/V mV V mV A V V A A
-- -- 0.6 V VIN - EN = 0 V -- -250 -500 A VIN - P = 5 V 100 200 400 A 2.5 -- V -- -- 0.3 V C1 = 0.22 F 0.23 0.46 0.69 ms C1 = 0.47 F 0.5 1 1.5 ms Watchdog time (reset pulse C1 = 0.22 F 7.3 14.6 21.9 ms interval) C1 = 0.47 F 15 30 45 ms RESET output delay time (powerC1 = 0.22 F 14.6 29.2 44.0 ms on reset time) C1 = 0.47 F 30 60 90 ms RESET output delay time 75 200 450 A HALT output delay time 150 400 900 A HALT output delay time C2: open 3 10 25 A C2 = 4700 pF10% 1 2 3 ms VB minimum operating voltage Note3, Ta = 25C -- -- 2.0 V Vo minimum operating voltage Note4, Ta = 25C -- 0.8 1.0 V Driving current Note5, Ta = 40 to 85C 8 -- -- mA The bias current IB is the sum of all currents flowing into the pins [1], [7], [13], [14]. VTH1 is the threshold voltage relative to VREF, and is set using an external resistance. The minimum operating voltage of VB for the operation of various functions The minimum operating voltage Vo at which the HALT output and RESET output can be held at L (when the HALT and RESET output pull-up resistance is 1 k) B (pin [14]) driving current capacity
Rev.1.00, Aug.25.2003, page 4 of 8
M59350FP
Power Supply Monitoring/Watchdog Timer Timing Diagram
Cc= 4700pF Ci= 22F 1k 11 6 5 12 C2 1k Vout1 Vout2 Vo Co= 100F 13 14 4 Vin1 Vin2 18k 8 3 9 C1 7 1
Power Supply Monitor Timing Diagram
(When a normal pulse is input to P-RUN (pin [8]))
t0 (t0Vout2 (HALT: 6 pin) T3 T4 T3 T4 T3
Vout1 (RESET: 11 pin)
Rev.1.00, Aug.25.2003, page 5 of 8
M59350FP
Watchdog Timer Timing Chart (H input to Vin1 (pin [4], VREF))
(When "L" is input to pin [10] (EN), watchdog function halted)
t1(t1T2) t2(t2>T2)
Vin2 (P-RUN: 8 pin) T1+T2 t3 (t3Vout1 (RESET: 11 pin) T1 T2
T1
T2 T1
T2 T1 VthH
C1: 9 pin Output waveform ( T2 >> T1) VthL
Rev.1.00, Aug.25.2003, page 6 of 8
M59350FP
Application Example
VB
4700pF
1k + 22F -
14
B
7
COMP
1
VO
R1
13
P-RUN input
VB
RESET
11
8
P-RUN
HALT
6
+ 100F -
EN input
10
EN
VREF
4
3
IAdj
C2
5
9
C1
VoAdj
2
R2 18k + 0.47F GND
12
Detection voltage set through R1:R2 resistance ratio
Rev.1.00, Aug.25.2003, page 7 of 8
M59350FP
14P2N-A
JEDEC Code -- e b2 Weight(g) 0.2 Lead Material Cu Alloy
MMP
Plastic 14pin 300mil SOP
EIAJ Package Code SOP14-P-300-1.27
Package Dimensions
14
8
HE
E
L1
L
Rev.1.00, Aug.25.2003, page 8 of 8
e1
Recommended Mount Pad Symbol
1 7
F A
G
D
A2
b
A1
x
M
e y
z Detail G Detail F
c
A A1 A2 b c D E e HE L L1 z Z1 x y b2 e1 I2
Z1
Dimension in Millimeters Min Nom Max -- -- 2.1 0 0.1 0.2 -- 1.8 -- 0.35 0.4 0.5 0.18 0.2 0.25 10.0 10.1 10.2 5.2 5.3 5.4 -- 1.27 -- 7.5 7.8 8.1 0.4 0.6 0.8 -- 1.25 -- -- 1.24 -- -- -- 1.39 -- -- 0.25 -- -- 0.1 -- 0 8 -- 0.76 -- -- 7.62 -- 1.27 -- --
I2
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