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E-raamat: Simplified Design of Microprocessor-Supervisory Circuits

(An established writer of international best-sellers in the field of electronics, Mr. Lenk is the author of more than 80 books on electronics, which together have sold well over two million copies in nine languages.)
  • Formaat: PDF+DRM
  • Sari: EDN Series for Design Engineers
  • Ilmumisaeg: 12-May-1998
  • Kirjastus: Newnes (an imprint of Butterworth-Heinemann Ltd )
  • Keel: eng
  • ISBN-13: 9780080517193
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Simplified Design of Microprocessor-Supervisory CircuitsSuurem pilt
  • Formaat: PDF+DRM
  • Sari: EDN Series for Design Engineers
  • Ilmumisaeg: 12-May-1998
  • Kirjastus: Newnes (an imprint of Butterworth-Heinemann Ltd )
  • Keel: eng
  • ISBN-13: 9780080517193
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This is the seventh book in the popular Simplified Design series from John Lenk, which teaches engineers, technicians, and students to use and modify off-the-shelf ICs to suit their individual design needs.

The first chapter of this book describes the basic operation of microprocessor supervisory circuits and how to use manufacturer data sheets to make your component selections. Later chapters describe the internal operations of various commonly-available ICs and how to select and modify them.

The most common microprocessor-supervisory functions include: power-on reset, low-voltage reset for glitch and brownout, memory-write protection, power-fail warning, battery backup switchover, and watchdog timer. While these functions are not difficult to implement individually, they can be complex in combination, particularly when there are space limitations. Simplified Design of Microprocessor-Supervisory Circuits will allow designers to evaluate tradeoffs and features more easily and quickly.

In the EDN Series for Design Engineers
Specifications and modification hints for many IC types
Shows how to use and modify off-the-shelf ICs for semi-custom supervisory circuits

Muu info

In the EDN Series for Design Engineers Specifications and modification hints for many IC types Shows how to use and modify off-the-shelf ICs for semi-custom supervisory circuits
Preface xiii(2)
Acknowledgments xv
1 The Microprocessor-Supervisory Functions
1(12)
1.1 Power-On Reset
2(1)
1.2 Low-Voltage (Glitch/Brownout) Reset
2(1)
1.3 Memory-Write Protection
2(1)
1.4 Power-Fail Warning
3(1)
1.5 Battery-Backup Switchover
3(1)
1.6 Watchdog Timer
4(1)
1.7 Monitoring Multiple Power Supplies
4(1)
1.8 Manual Reset
4(1)
1.9 Parallel Outputs
5(1)
1.10 Detailed Description of Internal Circuits
6(1)
1.11 Battery-Switchover and V (OUT) Circuit Operation
6(3)
1.12 Reset Output
9(1)
1.13 Chip-Enable Gating and RAM Write Protection
10(1)
1.14 1.3-V Comparator and Power-Fail Warning
11(1)
1.15 Watchdog Timer and Oscillator
11(2)
2 Multifunction 5-V Microprocessor-Supervisory Integrated Circuits
13(12)
2.1 Basic Characteristics of MAX690A Series
15(1)
2.2 Reset Output for MAX690A Series
15(4)
2.3 Watchdog Input for MAX690A Series
19(1)
2.4 Power-Fail Comparator for MAX690A Series
19(1)
2.5 Backup-Battery Switchover for MAX690A Series
19(2)
2.6 Using Capacitors as Backup Power Sources
21(1)
2.7 Allowable Backup Power-Source Batteries
22(1)
2.8 Operation without a Backup Power Source
22(1)
2.9 Replacing the Backup Battery
22(1)
2.10 Adding Hysteresis to the Power-Fail Comparator
22(1)
2.11 Monitoring a Negative Voltage
23(1)
2.12 Interfacing Microprocessors with Bidirectional Reset
23(2)
3 3.0-V/3.3-V Microprocessor-Supervisory Integrated Circuits
25(14)
3.1 Basic Characteristics of MAX690T/S/R Series
25(1)
3.2 Reset Output for MAX690T/S/R Series
26(1)
3.3 Reset Threshold for MAX690T/S/R Series
27(2)
3.4 Watchdog Input for MAX690T/S/R Series
29(3)
3.5 Power-Fail Comparator for MAX690T/S/R Series
32(1)
3.6 Backup-Battery Switchover for MAX690T/S/R Series
32(1)
3.7 Manual Reset for MAX690T/S/R Series
33(1)
3.8 Short Circuit Problems for MAX690T/S/R Series
33(1)
3.9 Capacitor Backup Power
34(1)
3.10 Eliminating the Backup Power Source
34(1)
3.11 Backup-Battery Replacement
34(1)
3.12 Power-Fail Comparator Hysteresis
34(1)
3.13 Monitoring an Additional Power Supply
35(1)
3.14 Interfacing for Bidirectional Resets
36(1)
3.15 Negative-Going V(CC) Transients
37(1)
3.16 Basic Manual Reset Circuit with Battery Backup
37(2)
4 Microprocessor-Supervisory Integrated Circuits with Chip-Enable
39(18)
4.1 Basic Characteristics of MAX691A Series
39(1)
4.2 General Description of MAX691A Series
39(1)
4.3 RESET and RESET Outputs
40(4)
4.4 The Watchdog Function
44(1)
4.5 Watchdog Input
45(1)
4.6 Watchdog Output
45(1)
4.7 Alternative Watchdog and Reset Timeouts
46(1)
4.8 Chip-Enable Signal Gating
47(1)
4.9 Chip-Enable Input
48(1)
4.10 Chip-Enable Propagation Delay
49(1)
4.11 Chip-Enable Output
50(1)
4.12 LOW LINE Output
50(1)
4.13 Power-Fail Comparator
50(1)
4.14 Power-Fail Input
50(1)
4.15 Power-Fail Output
51(1)
4.16 Battery-Backup Mode for MAX691A Series
51(1)
4.17 Battery-On Output
52(1)
4.18 Input Supply Voltage
52(1)
4.19 Backup-Battery Input
52(1)
4.20 Output Supply Voltage
52(1)
4.21 General Application Notes for MAX691A Series
53(1)
4.22 Capacitor Backup for MAX691A Series
53(1)
4.23 Using Separate Supplies for V(BATT) and V(CC)
53(1)
4.24 Alternative Chip-Enable Gating
54(1)
4.25 Adding Hysteresis to the PFO
54(1)
4.26 Negative Supply Voltages
54(2)
4.27 Replacing the Backup Battery
56(1)
4.28 Negative V(CC) Transients
56(1)
5 Low-Cost Microprocessor-Supervisory Integrated Circuits with Battery Backup
57(12)
5.1 Basic Characteristics of MAX703/704
57(2)
5.2 General Description of MAX703/704
59(1)
5.3 RESET Output for MAX703/704
59(3)
5.4 Power-Fail Comparator for MAX703/704
62(1)
5.5 Backup-Battery Switchover for MAX703/704
62(1)
5.6 Manual Reset for MAX703/704
63(1)
5.7 Using Capacitors for Backup
63(1)
5.8 Backup Power Sources
64(1)
5.9 Operating without Backup Power
65(1)
5.10 Ensuring a Valid RESET Output Down to V(CC)=0
65(1)
5.11 Battery Replacement
65(1)
5.12 Adding Hysteresis
66(1)
5.13 Negative Voltages
66(1)
5.14 Reset with the Power-Fail Comparator
67(2)
6 Low-Cost Microprocessor Supervisory Integrated Circuits with Watchdog
69(10)
6.1 Basic Characteristics for MAX705 Series
69(2)
6.2 General Description of MAX705 Series
71(1)
6.3 Reset Output for MAX705 Series
71(1)
6.4 Watchdog Timer for MAX705 Series
72(2)
6.5 Manual Reset for MAX705 Series
74(1)
6.6 Power-Fail Comparator for MAX705 Series
74(1)
6.7 Valid RESET with A V(CC) of Zero
75(1)
6.8 Monitoring Voltages Other Than Unregulated DC
76(1)
6.9 Monitoring Negative Voltages
76(1)
6.10 Bidirectional Reset
77(2)
7 3-V Low-Cost Microprocessor-Supervisory Integrated Circuits
79(12)
7.1 Basic Characteristics of MAX706/708
79(2)
7.2 General Description of MAX706/708
81(1)
7.3 RESET and RESET Outputs for MAX706/708
82(3)
7.4 Watchdog Timer for MAX706P/R/S/T
85(1)
7.5 Manual Reset for MAX706/708
86(1)
7.6 Power-Fail Comparator for MAX706/708
86(1)
7.7 Operation with +3-V and +5-V Supplies
86(1)
7.8 Ensuring a Valid RESET Output Down to V(CC)=0 V
87(1)
7.9 Adding Power-Fail Hysteresis
88(1)
7.10 Monitoring Negative Voltages for MAX706/708
88(3)
8 Complete Microprocessor-Supervisory Integrated Circuit
91(18)
8.1 Basic Characteristics for MAX791
91(2)
8.2 General Description for MAX791
93(2)
8.3 Manual Reset Input
95(1)
8.4 RESET Output for MAX791
96(3)
8.5 Watchdog Function for MAX791
99(1)
8.6 Watchdog Input for MAX791
99(1)
8.7 Watchdog Output for MAX791
99(1)
8.8 Watchdog-Pulse Output
99(1)
8.9 Selecting an Alternative Watchdog Timeout
100(1)
8.10 Chip-Enable Signal Gating
101(1)
8.11 Chip-Enable Input for MAX791
101(1)
8.12 Chip-Enable Output Impedance
102(1)
8.13 LOW LINE Output
102(1)
8.14 Power-Fail Comparator for MAX791
102(1)
8.15 Battery-Backup Mode for MAX791
103(1)
8.16 Output Supply Voltage for MAX791
104(1)
8.17 Low-Battery Monitor for MAX791
105(1)
8.18 Applications Considerations for MAX791
105(1)
8.19 Using Capacitors with the MAX791
106(1)
8.20 Operation with Separate Supplies for V(CC) and V(BATT)
106(1)
8.21 Alternative Chip-Enable Gating for MAX791
107(1)
8.22 Adding Hysteresis to the MAX791 Power-Fail Comparator
107(1)
8.23 Monitoring Negative Voltages with the MAX791
107(1)
8.24 Backup-Battery Replacement for the MAX791
108(1)
9 Microprocessor and Nonvolatile Memory Supervisory Integrated Circuits
109(18)
9.1 Basic Characteristics for MAX792/820
109(2)
9.2 General Description of MAX792/820
111(2)
9.3 Manual-Reset Input for MAX792/820
113(1)
9.4 Monitoring a Regulated Supply
114(1)
9.5 Monitoring a Supply with Internal Threshold
114(2)
9.6 Monitoring a Supply with External Programming
116(3)
9.7 Using the LOW LINE Output
119(1)
9.8 Reset Function for MAX792/820
119(1)
9.9 Reset Outputs for MAX792/820
120(1)
9.10 Overvoltage Comparator for MAX792/802
120(1)
9.11 Watchdog Function for MAX792/820
120(1)
9.12 Watchdog Input for MAX792/820
121(1)
9.13 Watchdog Output for MAX792/820
121(1)
9.14 Consecutive Watchdog Faults
122(1)
9.15 Alternative Watchdog Timeout Periods for MAX792/820
123(1)
9.16 Chip-Enable Signal Gating
123(1)
9.17 Chip-Enable Input for MAX792/820
123(1)
9.18 Chip-Enable Output for MAX792/820
124(1)
9.19 Applications Considerations for MAX792/820
125(1)
9.20 Alternative Chip-Enable Gating for MAX792/820
125(1)
9.21 Interfacing to Bidirectional Resets for MAX792/820
125(2)
10 Simplified Design Approaches
127(102)
10.1 MC6800 Interface with Resistive or Inductive Loads
127(1)
10.2 MC68000 Interface with Resistive or Inductive Loads
127(1)
10.3 Serial DRAM Nonvolatizer
128(2)
10.4 Auxiliary Boost Supply for Microprocessor-Based Systems
130(1)
10.5 RS-232 Transceiver for Microprocessor-Based Systems
130(3)
10.6 Power Monitor for Microprocessor-Based Systems
133(1)
10.7 Power Monitor for Microprocessor-Based Systems with Line Isolation
133(1)
10.8 Line-Operated Power Monitor for Microprocessor-Based Systems
134(1)
10.9 Low-Power Microprocessor Monitor with Push Button
134(1)
10.10 Low-Power Microprocessor Monitor with Push Button and Watchdog Timer
135(1)
10.11 Automatic Reset Integrated Circuit for Microprocessor-Based Systems
136(1)
10.12 Microprocessor Power Monitor with Watchdog Timer and Push Button
137(1)
10.13 Microprocessor Power Monitor with Early Warning
137(1)
10.14 Memory Backup for SRAMs
138(1)
10.15 Power Switching for SRAMs
139(1)
10.16 Discrete-Component Watchdog Timer
140(1)
10.17 Discrete-Component Power-On Reset
140(1)
10.18 Microprocessor Supervisory Circuit Design Summary
141(2)
10.19 Alternative Microprocessor-Supervisory Circuit Design Summary
143(1)
10.20 Externally Adjustable Reset Threshold
144(1)
10.21 Reset for Both Overvoltage and Undervoltage
144(1)
10.22 Backup-Battery Monitor with Optional Test Load
145(1)
10.23 Adding Hysteresis to the Power-Fail Circuit
145(1)
10.24 Disabling the Watchdog under Program Control
146(1)
10.25 Extending the Watchdog Timeout Period
147(1)
10.26 Low-Cost Power-On Reset and Watchdog Controller
147(1)
10.27 Power-Supply Monitor with Reset
147(1)
10.28 Universal Voltage Monitors for Microprocessor-Based Systems
148(2)
10.29 Quad Undervoltage Detector
150(1)
10.30 Quad Undervoltage Detector with LED Indicators
150(1)
10.31 Quad Overvoltage Detector with LED Indicators
150(1)
10.32 Quad Undervoltage Detector with Single LED Indicator
151(2)
10.33 Alternative Quad Overvoltage Detector
153(1)
10.34 Overvoltage/Undervoltage Detector (Window Detector)
154(1)
10.35 Dual-Negative Undervoltage Detector
155(1)
10.36 Dual-Negative Overvoltage Detector
156(1)
10.37 Negative Overvoltage-Undervoltage Detector (Window Detector)
156(2)
10.38 Microprocessor Reset Circuit with Time Delay
158(1)
10.39 Alternative Microprocessor Reset Circuit with Time Delay
159(1)
10.40 Undervoltage Monitor for Low Voltage in Microprocessor Systems
159(1)
10.41 Undervoltage Monitoring for 3.3-V Microprocessor-Based Systems
159(1)
10.42 Dedicated Microprocessor Voltage Monitors
160(1)
10.43 Undervoltage-Overvoltage Comparator
160(1)
10.44 Monitoring the Supply for Overvoltage-Undervoltage
161(1)
10.45 Voltage Monitor with Microprocessor Reset
161(1)
10.46 Alternative Voltage Monitor with Microprocessor Reset
161(2)
10.47 Nonvolatile RAM Controller
163(2)
10.48 Three-Pin Microprocessor Reset Monitor
165(1)
10.49 8051 Interface (LTC1090)
165(4)
10.50 MC68HC05 Interface (LTC1090)
169(3)
10.51 HD63705VO Interface (LTC1090)
172(2)
10.52 COP820C Interface (LTC1090)
174(2)
10.53 TMS7742 Interface (LTC1090)
176(3)
10.54 COP402N Interface (LTC1090)
179(2)
10.55 8051 Microprocessor Interface (LTC1091)
181(3)
10.56 68HCO5 Interface (LTC1091)
184(2)
10.57 COP82OC Interface (LTC1091 DAS)
186(2)
10.58 TMS7742 Interface (LTC1091)
188(3)
10.59 COP402N Interface (LTC1091)
191(2)
10.60 HD63705 Interface (LTC1091)
193(3)
10.61 TMS320C25 Interface
196(5)
10.62 TMS320C25 Interface (LTC1091/92)
201(5)
10.63 Z-80 Interface (LTC1090)
206(3)
10.64 HD64180 Interface (LTC1090)
209(3)
10.65 HA64180 Interface (LTC1091)
212(2)
10.66 Interfacing to a Parallel Bus
214(3)
10.67 8051 Microprocessor 12-Bit Interface
217(5)
10.68 MC68HCO5 12-Bit Interface
222(2)
10.69 TMS370 Interface
224(5)
For Further Information 229(2)
Index 231


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