M5295AL/AP/AFP Watchdog Timer REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Description M5295A is a semiconductor integrated circuit which is designed for system reset to detect +5 V power supply. This IC keeps the operation microcomputer watching. When the system is abnormal, it generates reset output until the system returns to normal states of the system. It is possible to vary the two detective voltage by connecting the resistor, so it is suitable to high quality and high performance system. Features • • • • Watchdog timer Power on reset timer Low circuit current: 0.8 mA (Typ, VCC = 5 V) Wide supply voltage range: VCC(max) = 15 V Application • Microcomputer system Recommended Operating Condition • Supply voltage range: 4 V to 15 V • Rated supply voltage: 5 V Block Diagram F.F F.F – + – + 49.6k 51.2k – + + – 20.4k 18.8k 1.24V Reference voltage generator circuit W.D.T F.F 20k 30k 1 WD 2 TC 3 RST1 REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 1 of 12 4 GND 5 ADJ1 6 VCC 7 RST2 8 ADJ2 M5295AL/AP/AFP Pin Arrangement M5295AP M5295AFP M5295AL 8 ADJ2 WD 1 8 ADJ2 7 RST2 TC 2 7 RST2 6 VCC RST1 3 5 ADJ1 4 GND 3 RST1 2 TC 1 WD (Top view) Outline: PRSS0008AA-A (8P5) [AL] REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 2 of 12 6 VCC 5 ADJ1 GND 4 (Top view) Outline: PRDP0008AA-A (8P4) [AP] PRSP0008DE-C [AFP] (recommend) PRSP0008DA-A (8P2S-A) [AFP] (not recommend for new design) M5295AL/AP/AFP Absolute Maximum Ratings (Ta = 25°C, unless otherwise noted) Item Supply voltage Input voltage Output voltage Output current Power dissipation Thermal derating Operating temperature Storage temperature Symbol Ratings 15 –10 to +10 15 10 800(AL)/625(AP)/440(AFP) 8.0(AL)/6.25(AP)/4.4(AFP) –20 to +75 –55 to +125 VCC VIN VOUT IOUT Pd Kθ Topr Tstg Unit V V V mA mW mW/°C °C °C Electrical Characteristics (Ta = 25°C, unless otherwise noted) DC Characteristics Test Conditions Item WD input current WD input voltage TC output current TC input current Threshold voltage of watchdog timer Output voltage Output leakage current VCC detective voltage (1) VCC detective voltage (2) ADJ1 voltage ADJ2 voltage RST1 on voltage RST2 on voltage Circuit current Symbol IIH IIL VIH VIL IOUT IIN VTH3(H) VTH3(L) VOL Ileak VTH1 VTH2(H) VTH2(L) ∆VTH2 V5 V8 RST1 RST2 ICC Min 0.06 –0.05 2 — — — 3.7 1.7 — — 4.05 4.5 4.45 0.05 1.17 1.07 — — — Typ 0.15 –0.1 — — — 3.3 4 2 0.1 — 4.25 4.7 4.6 0.1 1.46 1.34 — — 0.8 Max 0.25 –0.15 — 0.8 –1 — 4.3 2.3 0.5 5 4.45 4.9 4.75 0.2 1.75 1.61 0.5 0.5 1.5 Unit mA Pin WD V WD µA mA V TC TC TC VIN = 1.5V VOUT = 4.2V V µA V V RST1 RST2 VCC VCC IOUT = 1mA VOUT = 15V V V V V mA ADJ1 ADJ2 RST1 RST2 VCC Min — 0.5 — 0.2 — 40 3 — — Typ 1.1⋅C⋅R1 1.1 0.5⋅C⋅R1 0.5 830⋅C 83 — 20 10 Max — 1.7 — 1.1 — 220 — — — Unit s ms s ms s µs µs µs VIN = 5V VIN = –5V VCC = 1.2V, RL = 4.7kΩ VCC = 1.2V, RL = 4.7kΩ DC Characteristics Test Conditions Item Watchdog timer Symbol TWD Reset timer (1) tRST(1) Reset timer (2) tRST(2) Input pulse watch Transmittal delay time tWDIN td1 td2 REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 3 of 12 Pin RST1 C = 0.1µF, R1 = 10kΩ RST1 RST1 WD RST1 RST2 C = 0.1µF, R1 = 10kΩ R1 = 10kΩ C = 0.1µF, R1 = 10kΩ M5295AL/AP/AFP Operating Description VTH2(H) VTH1 VTH2(L) VTH1 VCC 0V VTH3(H) TC VTH3(L) 0V VIN 0V RST1 0V RST2 0V tRST(1) (1) (2)(3) tWD tRST(2) (4) (5) (6) (7) (8) (9)(10)(11) (1): The VCC rises up to 0.8 V, then RST1 and RST2 generates low output, and rising up to 4.25 V, charge of C1 begins. (2): The VCC rises up to 4.7 V, then RST2 generates high. (3), (4): The voltage at TC pin is 2 V, then RST2 generates high, when 4 V, C1 is discharged and RST1 generates low. (5): The voltage at TC pin falls to 2 V, then RST1 generates high unless normal clock signal is entered to WD pin, RST1 repeats this operation. (6), (7): Before the voltage at TC pin reaches 4 V, if normal clock signal is entered to WD pin, low RST1 is canceled. (8), (9): In the case of entrance of abnormal signal input, as the waveform of TC pin repeats charge and discharge of RST1 alternatively from 2 V to 4 V, the RST1 repeats high and low output operation. (10): The VCC falls to 4.6 V, then RST2 generates low, this detective voltage has a 100 mV hysteresis. (11): When VCC goes down to 4.25 V(VTH1), the status of TC pin is switched to discharge. When the potentional at TC pin is detected being VTH3(H) or VTH3(L), the status of RST1 becomes "low". Terminology tRST(1): Time required for TC pin potential to rise from 0 V VTH3(L) when VCC is being applied. tWD : Time required for TC pin potential to rise from VTH3(L) to VTH3(H). tRST(2): Time required for TC pin potential to go down from VTH3(H) to VTH3(L). Figure 1 Operating Waveform REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 4 of 12 M5295AL/AP/AFP 1. Pin(2) (TC pin) charge time and discharge time When input to WD pin is abnormal, TC pin output waveform is as shown below: 4 ⋅ VCC 5 TC 2 ⋅V CC 5 0V tWD tRST(1) tRST(2) tRST(1) = 0.51 ⋅ C ⋅ R1 tWD = 1.1 ⋅ C ⋅ R1 (charge time) VCC R1 –1 1000 tRST(2) = 1000 ⋅ C ⋅ ln (discharge time) R1 2⋅ –3 1000 4⋅ R1 Resistance R1: 10kΩ ≤ R1 ≤ 30kΩ When R1 is 10kΩ, tRST(2) is 830 ⋅ C 2 C Figure 2 2. Pin (1) (WD pin) input frequency, input pulse width, charge time and discharge time When input to WD pin is normal, TC pin output waveform is as shown below: (VCC = 5V) 4V Pin (2) xV 2V t1 t2 Input tWDIN t1 = C ⋅ R1 ⋅ ln 3 5–x ( t2 = 1000 ⋅ C ⋅ ln (charge time) R1 + 1) x – 5 1000 2 ⋅ R1 – 3 1000 Figure 3 REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 5 of 12 (discharge time) M5295AL/AP/AFP • Pin (1) (WD pin) input requirements (1) Connect capacitor between WD pin and voltage input. (refer to section 3) (2) Input cycle: tWD or less (discharge should start before voltage at WD pin reaches 4 V.) 1 <f 1.1 ⋅ C ⋅ R1 (3) Input pulse width tWDIN: t2 or less C = 104 1ms t t1 C = 103 100µs VCC = 5V R1 = 10kΩ 50µs 0.5 ms t2 2 3 4 Discharge Voltage x(V) Figure 4 3. Relationship between input pulse width and input capacitance Cin When input to pin (1) is 1.5 V or more, TC pin discharges electricity. Determine pulse width and input capacitance Cin with reference to the diagram shown in figure 5. Vin VIN t t4 Vin VIN 30k 1 Cin Q1 20k WD (1) 1.5V t t3 TC (2) 4V tWD Q1 is off when voltage at pin (1) is 1.5V or less. t3 = Cin ⋅ 5 × 104 ⋅ ln Vin 1.5 RST1 (3) 2V t t Cin: 10000pF, t3 = 0.6ms Cin: 1000pF, t3 = 60µs Cin: 100pF, t3 = 6µs RST1 is output when t4 is longer than tWD. When t3 is too long, TC pin output waveform frequency changes as shown above. Set t3 to be sufficiently long to turn on Q1 [tWDIN(3µs) or more] but not to exceed t2 (discharge time). (t2: Discharge time during normal input) Figure 5 REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 6 of 12 M5295AL/AP/AFP 4. VCC detection voltage adjustment (1) Detection voltage 1 (VTH1) adjustment VTH1 (V) 13 10 7 5 4.25 4 3.5 6 R1 49.6k RL + – 5 R2 3 20.4k 1.24V R1 (kΩ) 10 10 10 10 — 10.90 8.59 R2 (kΩ) Detection voltage calculation formula 0.92 1.25 VTH1 = R01 + R02 × 1.24 (V) 1.96 R02 3.17 R01 = R1 // 49.6kΩ — R02 = R2 // 20.4kΩ 5 5 To adjust detection voltage 1, determine external resistance with the following equations. 4 (a) VTH1 > 4.25V (R1 = 10kΩ) R2 = 1 1 1 – R0 20.4k (R0 = 8.322k × 1.24 ) VTH1 – 1.24 (R0 = (VTH1 – 1.24) 4.016k ) 1.24 (b) VTH1 < 4.25V (R2 = 5kΩ) R1 = 1 1 1 – R0 49.6k Figure 6 Detection Voltage 1 (VTH1) Adjustment (2) Detection voltage 2 (VTH2(L)) adjustment 6 R3 51.2k + – 8 R4 RL 18.8k 1.24V 4 7 VTH2(L) (V) R3 (kΩ) 10 13 10 10 10 7 10 5 — 4.6 10.61 4 8.38 3.5 R4 (kΩ) ∆VTH2 (mV) Detection voltage calculation formula 0.93 16.3 VTH2(L) = R03 + R04 × 1.24 (V) 1.26 16.3 R04 1.99 16.3 R03 = R3 // 51.2kΩ 3.24 16.3 R04 = R4 // 18.8kΩ — 100 5 17.2 ∆VTH2 = R03 × 100 (mV) 51.2k 5 14.1 To adjust detection voltage 2, determine external resistance with the following equations. (a) VTH2(L) > 4.6V (R3 = 10kΩ) R4 = 1 1 – 1 R0 18.8k (R0 = 8.37k × 1.24 ) VTH2(L) – 1.24 (b) VTH2(L) < 4.6V (R4 = 5kΩ) R3 = 1 1 – 1 R0 51.2k (R0 = (VTH2(L) – 1.24) 3.95k ) 1.24 Figure 7 Detection Voltage 2 (VTH2(L)) Adjustment REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 7 of 12 M5295AL/AP/AFP Application Example M5295A 1 2 3 4 5 6 RST1 (RESET) MCU/MPU Clock 7 8 RST2 (HOLD) VDD Figure 8 Application Example Notice for Use 1. When malfunction occurs due to noise or order related trouble, connect capacitance of approximately 1000 pF between pin (5) and GND as well as pin (8) and GND to stabilize operation. 2. To adjust detection voltage, add resistance of 15 kΩ or less to both VCC and GND via adjusting pins. (Set detection voltage to no less than 3 V.) 3. Set tWD and tRST(2) as shown below: 110 µs ≤ tWD ≤ 1.1 s 8.3 µs ≤ tRST(2) ≤ 83 ms 10 kΩ ≤ R1 ≤ 30 kΩ 4. Input clock pulses to pin (1) via capacitor. To determine capacitance, refer to “Relationship between input pulse width and input capacitance Cin”. Backup power supply M5295A 10kΩ 3.5V R4 1 2 3 4 5 6 7 8 R3 VCC RESET output To System Backup switching voltage VTH2(L) Switching voltage calculation formula VTH2(L) = R03 + R04 × 1.24 (V) R04 R03 = R3 // 51.2kΩ R04 = R4 // 18.8kΩ Note: Set backup switching voltage to be more than or equal to backup supply voltage. Figure 9 Example of Backup Circuit with M5295AL REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 8 of 12 M5295AL/AP/AFP Typical Characteristics Thermal Derating (Maximum Rating) Detection Voltage vs. Ambient Temperature 4.9 800 Detection Voltage VTH (V) Power Dissipation Pd (mW) 1000 M5295AL M5295AP 600 M5295AFP 400 200 0 0 25 50 75 100 4.8 4.5 4.4 4.3 4.0 1.4 Circuit Current vs. Supply Voltage 3.5 Circuit Current ICC (mA) Circuit Current ICC (mA) VCC = 5V 0.6 0.4 0.2 0 –40 –20 0 RL = 4.7kΩ 3.0 2.5 2.0 1.5 RST1 High RST2 High 1.0 (ICC fluctuation caused by circuit operation) 0.5 0 0 20 40 60 80 100 120 2 0.6 0.5 RL = 2.2kΩ 0.4 0.3 RL = 22kΩ RL = 100kΩ 0.2 0.1 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 Supply Voltage VCC (V) REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 9 of 12 6 8 10 12 14 16 Delay Time vs. Delay Capacity 100 Delay Time tWD, tRST2 (ms) Output Voltage RST1, RST2 (V) Critical Operation Voltage Characteristics 0.8 CD = 0.01µF 4 Supply Voltage VCC (V) Ambient Temperature Ta (°C) 0.7 20 40 60 80 100 120 Ambient Temperature Ta (°C) Circuit Current vs. Ambient Temperature 1.6 0.8 VTH1 4.2 Ambient Temperature Ta (°C) 1.0 VTH2(L) 4.6 4.1 –40 –20 0 125 1.2 VTH2(H) 4.7 VCC = 5V 10 tWD (R1 = 10kΩ) 1 tRST2 0.1 0.01 0.01 0.1 1 10 Delay Capacity C (µF) 100 0.4 VCC = 5V RL = 4.7kΩ 0.3 0.2 0.1 0 –40 –20 0 20 40 60 80 100 120 Ambient Temperature Ta (°C) Output Saturation Voltage VOL (RST1), (RST2) (V) Output Saturation Voltage vs. Ambient Temperature Watchdog Timer Threshold voltage vs. Ambient Temperature 8 VCC = 5V 7 6 5 VTH3(H) 4 3 VTH3(L) 2 1 0 –40 –20 0 Output Saturation Voltage vs. Load Current 1.6 VCC = 5V 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0.1 VCC = 5V 6 5 4 3 2 1 1.0 0.8 0.6 0.4 0.2 0 –40 –20 0 Reset Timer(2) vs. Ambient Temperature 320 Reset Timer(2) tRST(2) (µs) Watchdog Timer tWD (ms) R1 = 10Ω 20 40 60 80 100 120 Ambient Temperature Ta (°C) REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 10 of 12 20 40 60 80 100 120 Ambient Temperature Ta (°C) Watchdog Timer vs. Ambient Temperature 1.6 1.2 100 7 Ambient Temperature Ta (°C) VCC = 5V 10 Load Current IOUT (mA) 0 –40 –20 0 20 40 60 80 100 120 1.4 C = 0.1µF 1 Pin TC Input Current vs. Ambient Temperature 8 Pin TC Input Current IIN (mA) Watchdog Timer Threshold voltage VTH3(H), (L) (V) Output Saturation Voltage VOL (RST1), (RST2) (V) M5295AL/AP/AFP VCC = 5V 280 C = 0.1µF 240 200 160 120 80 40 0 –40 –20 0 20 40 60 80 100 120 Ambient Temperature Ta (°C) M5295AL/AP/AFP Package Dimensions JEITA Package Code P-SIP8-6.4x19-2.54 RENESAS Code PRSS0008AA-A Previous Code 8P5 2.8 ±0.2 ±0.2 2.54 0.5 ±0.1 0.85 3.0 Min 1.2 Min 8.3 Max 6.4 19.0 MASS[Typ.] 0.73g +0.3 -0.1 1.2 ±0.1 1.2 +0.1 -0.3 RENESAS Code PRDP0008AA-A 5 1 4 MASS[Typ.] 0.5g c *1 E 8 Previous Code 8P4 +0.07 -0.05 e1 JEITA Package Code P-DIP8-6.3x8.84-2.54 0.27 NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET. *2 L A1 A A2 D SEATING PLANE *3 b 3 *3 b 2 bp e Reference Symbol e1 D E A A1 A2 bp b2 b3 c e L REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 11 of 12 Dimension in Millimeters Min Nom Max 7.32 7.62 7.92 8.7 8.9 9.1 6.15 6.3 6.45 4.5 0.51 3.3 0.4 0.5 0.6 0.9 1.0 1.3 1.4 1.5 1.8 0.22 0.27 0.34 15° 0° 2.29 2.54 2.79 3.0 M5295AL/AP/AFP JEITA Package Code P-SOP8-4.4x4.85-1.27 RENESAS Code PRSP0008DE-C *1 Previous Code — MASS[Typ.] 0.1g F D 8 NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET. 5 c *2 E HE bp Index mark Terminal cross section ( Ni/Pd/Au plating ) Reference Symbol 4 1 *3 e Z bp x M A A2 L1 A1 θ L y Detail F JEITA Package Code P-SOP8-4.4x5-1.27 RENESAS Code PRSP0008DA-A Min Nom Max 4.65 4.85 5.05 4.2 4.4 4.6 1.85 0.00 0.1 0.20 2.03 0.34 0.4 0.46 0.15 0.20 0.25 0° 8° 5.7 6.2 6.5 1.12 1.27 1.42 0.12 0.10 0.75 0.25 0.45 0.65 0.90 MASS[Typ.] 0.07g E 5 *1 HE 8 Previous Code 8P2S-A D E A2 A1 A bp b1 c c1 θ HE e x y Z L L1 Dimension in Millimeters F 1 NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET. 4 Index mark c A2 *2 A1 D L A Reference Symbol *3 e bp y D E A2 A1 A bp c Detail F HE e y L REJ03D0780-0200 Rev.2.00 Jun 15, 2007 Page 12 of 12 Dimension in Millimeters Min Nom Max 4.8 5.0 5.2 4.2 4.4 4.6 1.5 0.05 1.9 0.35 0.4 0.5 0.13 0.15 0.2 0° 10° 5.9 6.2 6.5 1.12 1.27 1.42 0.1 0.2 0.4 0.6 Sales Strategic Planning Div. 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