ANALOG DEVICES ADM8690, ADM8691 Service Manual

Microprocessor

www.BDTIC.com/ADI

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695

FEATURES

Upgrade for ADM690 to ADM695, MAX690 to MAX695 Specified over temperature Low power consumption (0.7 mW) Precision voltage monitor Reset assertion down to 1 V V

CC

Low switch on resistance 0.7 Ω normal, 7 Ω in backup High current drive (100 mA) Watchdog timer: 100 ms, 1.6 s, or adjustable 400 nA standby current Automatic battery backup power switching Extremely fast gating of chip enable signals (3 ns) Voltage monitor for power fail Available in TSSOP package

APPLICATIONS

Microprocessor systems Computers Controllers Intelligent instruments Automotive systems

PRODUCT HIGHLIGHTS

The ADM8690, ADM8692, and ADM8694 are available in 8-lead, PDIP packages and provide:

1. P

ower-on reset output during power-up, power-down, and

RESET

brownout conditions. The operational with V

2. B

attery backup switching for CMOS RAM, CMOS

as low as 1 V.

CC

microprocessor, or other low power logic.

reset pulse if the optional watchdog timer has not been

3. A

toggled within a specified time.

4. A 1.3 V t

hreshold detector for power-fail warning, low battery

detection, or to monitor a power supply other than 5 V.

The ADM8691, ADM8693, and ADM8695 are available in 16-lead

nd small outline packages (including TSSOP) and

PDIP a provide three additional functions:

output remains

V

BATT

V

WATCHDOG INPUT (WDI)

POWER FAIL

INPUT (PFI)

V

BATT

V

CE

OSC IN

OSC SEL

WATCHDOG INPUT (WDI)

POWER FAIL

INPUT (PFI)

Supervisory Circuits

FUNCTIONAL BLOCK DIAGRAMS

CC

1

4.65V

WATCHDOG

TRANSITI ON DETECT OR

(1.6s)

1.3V

1

VOLTAG E DETECTO R = 4.65V (ADM8690, ADM8694)

4.40V (ADM8692)

2

RESET PULSE WIDT H = 50ms (AD8690, ADM8692)

200ms (ADM8694)

Figure 1. ADM8690/ADM8692/ADM8694

CC

IN

1

4.65V

RESET AND WATCHDOG

TIME BASE

WATCHDOG

TRANSIT ION DETE CTOR

1.3V

1

VOLTAG E DETECT OR = 4.65V (ADM8691, ADM86 95)

Figure 2. ADM8691/ADM8693/ADM8695

GENERATO R

BATT ON

RESET

GENERATOR

4.40V (ADM8693)

RESET

ADM8690/ ADM8692/

ADM8694

WATCHDOG

2

ADM8691/ ADM8693/ ADM8695

TIMER

V

OUT

RESET

POWER FAIL OUTPUT (PFO)

V

OUT

CE

OUT

LOW LINE

RESET

WATCHDOG OUTPUT (WDO)

POWER FAIL OUTPUT (PFO)

00093-001

00093-002

rite protection of CMOS RAM or EEPROM.

1. W

djustable reset and watchdog timeout periods.

2. A

3. S

eparate watchdog timeout, backup battery switchover, and

low V

status outputs.

CC

Rev. A

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695

www.BDTIC.com/ADI

REVISION HISTORY

9/06—Rev. 0 to Rev. A

Updated Format..................................................................Universal

Changes to Absolute Maximum Ratings....................................... 6

Updated Ordering Guide............................................................... 20

2/97—Revision 0: Initial Version

Rev. A | Page 2 of 20

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695

www.BDTIC.com/ADI

GENERAL DESCRIPTION

The ADM869x family of supervisory circuits offers complete single- chip solutions for power supply monitoring and battery control functions in microprocessor systems. These functions include microprocessor reset, backup battery switchover, watchdog timer, CMOS RAM write protection, and power failure warning. The complete family provides a variety of configurations to satisfy most microprocessor system requirements.

The ADM869x family is fabricated using an advanced epitaxial CMOS p

Table 1. Product Selection Guide

Part Number

ADM8690 50 ms 4.65 V 1.6 s Yes No No ADM8691 50 ms or ADJ 4.65 V 100 ms, 1.6 s, ADJ Yes Yes Yes ADM8692 50 ms 4.4 V 1.6 s Yes No No ADM8693 50 ms or ADJ 4.4 V 100 ms, 1.6 s, ADJ Yes Yes Yes ADM8694 200 ms 4.65 V 1.6 s Yes No No ADM8695 200 ms or ADJ 4.65 V 100 ms, 1.6 s, ADJ Yes Yes Yes

rocess combining low power consumption (0.7 mW),

Nominal Reset Time

Nominal VCC Reset Threshold

Nominal Watchdog Timeout Period

extremely fast chip enable gating (3 ns), and high reliability. RESET

assertion is guaranteed with VCC as low as 1 V. In addition, the power switching circuitry is designed for minimal voltage drop thereby permitting increased output current drive of up to 100 mA without the need of an external pass transistor.

See Tab le 1 for a product selection guide listing the characteristics o

f each device in the ADM869x family. To place an order, use

the Ordering Guide provided as the last section of this data sheet.

Battery Backup Switching

Base Drive Ext PNP

Chip Enable Signals

Rev. A | Page 3 of 20

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695

www.BDTIC.com/ADI

SPECIFICATIONS

VCC = full operating range, V

Table 2.

Parameter Min Typ Max Unit Test Conditions/Comments

BATTERY BACKUP SWITCHING

VCC Operating Voltage Range

ADM8690, ADM8691, ADM8694, ADM8695 4.75 5.5 V ADM8692, ADM8693 4.5 5.5 V

V

Operating Voltage Range

BATT

ADM8690, ADM8691, ADM8694, ADM8695 2.0 4.25 V ADM8692, ADM8693 2.0 4.0 V

V

Output Voltage VCC − 0.005 VCC − 0.0025 V I

OUT

V V

in Battery Backup Mode V

OUT

Supply Current (Excludes I Supply Current in Battery Backup Mode 0.4 1 µA VCC = 0 V, V Battery Standby Current 5.5 V > VCC > V

+ = Discharge, − = Charge −0.1 +0.02 µA TA = 25°C Battery Switchover Threshold 70 mV Power-up VCC – V

50 mV Power-down

BATT

Battery Switchover Hysteresis 20 mV BATT ON Output Voltage 0.3 V I BATT ON Output Short-Circuit Current 55 mA BATT ON = V

0.5 2.5 25 µA BATT ON = 0 V source current

RESET AND WATCHDOG TIMER

Reset Voltage Threshold

ADM8690, ADM8691, ADM8694, ADM8695 4.5 4.65 4.73 V

ADM8692, ADM8693 4.25 4.4 4.48 V Reset Threshold Hysteresis 40 mV Reset Timeout Delay

ADM8690, ADM8691, ADM8692, ADM8693 35 50 70 ms OSC SEL = high

ADM8694, ADM8695 140 200 280 ms OSC SEL = high Watchdog Timeout Period, Internal Oscillator 1.0 1.6 2.25 s Long period 70 100 140 ms Short period Watchdog Timeout Period, External Clock 3840 4064 4097 cycles Long period 768 1011 1025 cycles Short period Minimum WDI Input Pulse Width 50 ns VIL = 0.4, VIH = 3.5 V RESET Output Voltage @ VCC = 1 V RESET, LOW LINE Output Voltage

3.5 V I RESET, WDO Output Voltage

3.5 V I Output Short-Circuit Source Current 1 10 25 µA Output Short-Circuit Sink Current 25 mA WDI Input Threshold

1

Logic Low 0.8 V

Logic High 3.5 V WDI Input Current 1 10 µA WDI = V

−10 −1 µA WDI = 0 V

= 2.8 V, TA = T

BATT

) 140 200 µA I

OUT

MIN

to T

, unless otherwise noted.

MAX

− 0.2 VCC − 0.125 V I

CC

− 0.005 V

BATT

− 0.002 V I

BATT

4 20 mV I

0.05 0.4 V I

0.4 V I

= 1 mA

OUT

≤ 100 mA

OUT

= 250 µA, VCC < V

OUT

= 100 µA

OUT

= 2.8 V

BATT

+ 0.2 V

BATT

= 3.2 mA

SINK

= 4.5 V sink current

OUT

= 10 µA, VCC = 1 V

SINK

= 1.6 mA, VCC = 4.25 V

SINK

= 1 µA

SOURCE

= 1.6 mA

SINK

= 1 µA

SOURCE

OUT

BATT

− 0.2 V

Rev. A | Page 4 of 20

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695

www.BDTIC.com/ADI

Parameter Min Typ Max Unit Test Conditions/Comments

POWER-FAIL DETECTOR

PFI Input Threshold 1.25 1.3 1.35 V VCC = 5 V PFI Input Current −25 ±0.01 +25 nA PFO Output Voltage

0.4 V I

3.5 V I PFO Short-Circuit Source Current PFO Short-Circuit Sink Current

1 3 25 A 25 mA

CHIP ENABLE GATING

CEIN Threshold

0.8 V V

3.0 V VIH CEIN Pull-Up Current CE

Output Voltage

OUT

V V CE Propagation Delay

3 µA

0.4 V I

− 1.5 V I

OUT

− 0.05 V I

OUT

3 7 ns

OSCILLATOR

OSC IN Input Current ±2 µA OSC SEL Input Pull-Up Current 5 µA OSC IN Frequency Range 0 500 kHz OSC SEL = 0 V OSC IN Frequency with External Capacitor 4 kHz OSC SEL = 0 V, C

1

WDI is a three-level input that is internally biased to 38% of VCC and has an input impedance of approximately 5 MΩ.

= 3.2 mA

SINK

= 1 µA

SOURCE

PFI = low, PFO = 0 V PFI = high, PFO = V

IL

= 3.2 mA

SINK

= 3.0 mA

SOURCE

= 1 µA, VCC = 0 V

SOURCE

OSC

OUT

= 47 pF

Rev. A | Page 5 of 20

ADM8690/ADM8691/ADM8692/ADM8693/ADM8694/ADM8695

www.BDTIC.com/ADI

ABSOLUTE MAXIMUM RATINGS

TA = 25°C, unless otherwise noted.

Table 3.

Parameter Rating

VCC −0.3 V to +6 V V

−0.3 V to +6 V

BATT

All Other Inputs −0.3 V to V Input Current

VCC 200 mA V

50 mA

BATT

GND 20 mA

Digital Output Current 20 mA Power Dissipation, N-8 PDIP 400 mW

θJA Thermal Impedance 120°C/W

Power Dissipation, R-8 SOIC 400 mW

θJA Thermal Impedance 120°C/W

Power Dissipation, N-16 PDIP 600 mW

θJA Thermal Impedance 135°C/W

Power Dissipation, RU-16 TSSOP 600 mW

θJA Thermal Impedance 158°C/W

Power Dissipation, R-16 SOIC_N 600 mW

θJA Thermal Impedance 110°C/W

Power Dissipation, RW-16 SOIC_W 600 mW

θJA Thermal Impedance 73°C/W

Operating Temperature Range

Industrial (A Version) −40°C to +85°C

Lead Temperature (Soldering, 10 sec) 300°C Storage Temperature Range −65°C to +150°C

OUT

+ 0.5 V

Stresses above those listed under Absolute Maximum Ratings ma

y cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ESD CAUTION

Rev. A | Page 6 of 20

ANALOG DEVICES ADM8690, ADM8691 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

FEATURES

APPLICATIONS

PRODUCT HIGHLIGHTS

FUNCTIONAL BLOCK DIAGRAMS

TABLE OF CONTENTS

REVISION HISTORY

GENERAL DESCRIPTION

SPECIFICATIONS

ABSOLUTE MAXIMUM RATINGS

ESD CAUTION