DS1232SN各脚功能电路原理芯片引脚定义引脚图及功能IC贸易商-中国IC网-芯三七

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产品型号DS1232SN的概述

DS1232SN芯片概述及详解 DS1232SN芯片是由德州仪器（Texas Instruments）公司所研发的一款多功能的监测和复位器件，主要用于微控制器和嵌入式系统中，以确保系统在瞬态电压变化或电源故障时的可靠性与稳定性。DS1232SN能够检测电源电压的变化，提供复位信号回馈给微控制器，以避免在电源未稳定时的误操作。这款芯片特别适用于需要高可靠性的电源管理和监控系统中。详细参数 DS1232SN的关键参数如下： - 工作电压范围：4.5V 至 15V，适应多种电源供电环境。 - 静态电流：标准工作状态下的静态电流为10μA，极大地降低了设备的功耗。 - 复位延迟时间：典型值为200ms，确保系统稳定运行。 - 电压监控阈值：可设定电压监控阈值，通过外部电阻和电位器调整。 - 温度范围：工作温度范围为-40℃至+85℃，适用于各种环境条件下的应用。 - 引脚配置：包含多达8个引...

产品型号DS1232SN的Datasheet PDF文件预览

DS1232

MicroMonitor Chip

www.dalsemi.com

FEATURES

PIN ASSIGNMENT

ꢀ Halts and restarts an out-of-control

microprocessor

VCC

PBRST

ꢀ Holds microprocessor in check during power

transients

ꢀ Automatically restarts microprocessor after

power failure

RST

TOL

GND

ꢀ Monitors pushbutton for external override

ꢀ Accurate 5% or 10% microprocessor power

supply monitoring

DS1232 8-Pin DIP (300-mil)

See Mech. Drawings Section

ꢀ Eliminates the need for discrete components

ꢀ Space-saving, 8-pin mini-DIP

ꢀ Optional 16-pin SOIC surface mount package

ꢀ Industrial temperature -40°C to +85°C

available, designated N

PBRST

VCC

TOL

RST

GND

RST

DS1232S 16-Pin SOIC (300-mil)

See Mech. Drawings Section

PIN DESCRIPTION

PBRST

- Pushbutton Reset Input

- Time Delay Set

TOL

GND

RST

- Selects 5% or 10% V_CCDetect

- Ground

- Reset Output (Active High)

RST

- Reset Output (Active Low, open

drain)

- Strobe Input

V_CC

- +5 Volt Power

- No Connections

DESCRIPTION

The DS1232 MicroMonitor Chip monitors three vital conditions for a microprocessor: power supply,

software execution, and external override. First, a precision temperature-compensated reference and

comparator circuit monitors the status of V_CC. When an out-of-tolerance condition occurs, an internal

power fail signal is generated which forces reset to the active state. When V_CCreturns to an in-tolerance

condition, the reset signals are kept in the active state for a minimum of 250 ms to allow the power supply

and processor to stabilize.

1 of 7

111899

DS1232/DS1232S

The second function the DS1232 performs is pushbutton reset control. The DS1232 debounces the

pushbutton input and guarantees an active reset pulse width of 250 ms minimum. The third function is a

watchdog timer. The DS1232 has an internal timer that forces the reset signals to the active state if the

strobe input is not driven low prior to timeout. The watchdog timer function can be set to operate on

timeout settings of approximately 150 ms, 600 ms, and 1.2 seconds.

OPERATION - POWER MONITOR

The DS1232 detects out-of-tolerance power supply conditions and warns a processor-based system of

impending power failure. When V_CCfalls below a preset level as defined by TOL (Pin 3), the V_CC

comparator outputs the signals RST (Pin 5) and RST (Pin 6). When TOL is connected to ground, the RST

and RST signals become active as V_CCfalls below 4.75 volts. When TOL is connected to V_CC, the RST

and RST signals become active as V_CCfalls below 4.5 volts. The RST and RST are excellent control

signals for a microprocessor, as processing is stopped at the last possible moments of valid V_CC. On

power-up, RST and RST are kept active for a minimum of 250 ms to allow the power supply and

processor to stabilize.

OPERATION - PUSHBUTTON RESET

The DS1232 provides an input pin for direct connection to a pushbutton (Figure 2). The pushbutton reset

input requires an active low signal. Internally, this input is debounced and timed such that RST and RST

signals of at least 250 ms minimum are generated. The 250 ms delay starts as the pushbutton reset input is

released from low level.

OPERATION - WATCHDOG TIMER

A watchdog timer function forces RST and RST signals to the active state when the ST input is not

stimulated for a predetermined time period. The time period is set by the TD input to be typically 150 ms

with TD connected to ground, 600 ms with TD left unconnected, and 1.2 seconds with TD connected to

V_CC. The watchdog timer starts timing out from the set time period as soon as RST and RST are inactive.

If a high-to-low transition occurs on the ST input pin prior to timeout, the watchdog timer is reset and

begins to timeout again. If the watchdog timer is allowed to timeout, then the RST and RST signals are

driven to the active state for 250 ms minimum. The ST input can be derived from microprocessor

address signals, data signals, and/or control signals. When the microprocessor is functioning normally,

these signals would, as a matter of routine, cause the watchdog to be reset prior to timeout. To guarantee

that the watchdog timer does not timeout, a high-to-low transition must occur at or less than the minimum

shown in Table 1. A typical circuit example is shown in Figure 3.

2 of 7

DS1232/DS1232S

MICROMONITOR BLOCK DIAGRAM Figure 1

PUSHBUTTON RESET Figure 2

WATCHDOG TIMER Figure 3

3 of 7

DS1232/DS1232S

TIMING DIAGRAM: PUSHBUTTON RESET Figure 4

TIMING DIAGRAM: STROBE INPUT Figure 5

WATCHDOG TIMEOUTS Table 1

TIME-OUT

TD PIN

MIN

TYP

MAX

250 ms

1000 ms

2000 ms

GND

Float

V_CC

62.5 ms

250 ms

500 ms

150 ms

600 ms

1200 ms

4 of 7

DS1232/DS1232S

TIMING DIAGRAM: POWER-DOWN Figure 6

TIMING DIAGRAM: POWER-UP Figure 7

5 of 7

DS1232/DS1232S

ABSOLUTE MAXIMUM RATINGS*

Voltage on V CC Pin Relative to Ground

Voltage on I/O Relative to Ground

Operating Temperature

-0.5V to +7.0V

-0.5V to V_CC+ 0.5V

0°C to 70°C

Operating Temperature (Industrial Version)

Storage Temperature

Soldering Temperature

-40°C to +85°C

-55°C to +125°C

260°C for 10 seconds

* This is a stress rating only and functional operation of the device at these or any other conditions

above those indicated in the operation sections of this specification is not implied. Exposure to

absolute maximum rating conditions for extended periods of time may affect reliability.

RECOMMENDED DC OPERATING CONDITIONS

(0°C to 70°C)

PARAMETER

SYMBOL MIN

TYP

MAX

5.5

UNITS NOTES

Supply Voltage

V_CC

V_IH

4.5

2.0

5.0

V_CC+0.3

ST and PBRST Input High Level

ST and PBRST Input Low Level

V_IL

-0.3

+0.8

DC ELECTRICAL CHARACTERISTICS

(0°C to 70°C; V_CC=4.5 to 5.5V)

PARAMETER

SYMBOL MIN

TYP

MAX

UNITS NOTES

Input Leakage

I_IL

I_OH

-1.0

-8

+10

µA

Output Current @ 2.4V

Output Current @ 0.4V

Low Level @ RST

Output Voltage @ -500 µA

-10

I_OL

V_OL

V_OH

0.4

V_CC

1, 7

-0.5V -0.1V

0.5

Operating Current

I_CC

2.0

V_CCTrip Point (TOL=GND)

V_CCTrip Point (TOL=V_CC)

V_CCTP

4.50

4.25

4.62

4.37

4.74

4.49

CAPACITANCE

PARAMETER

(t_A=25°C)

UNITS NOTES

SYMBOL MIN

TYP

MAX

Input Capacitance

Output Capacitance

C_IN

C_OUT

6 of 7

DS1232/DS1232S

AC ELECTRICAL CHARACTERISTICS

(0°C to 70°C; V_CC=5V ± 10%)

PARAMETER

SYMBOL MIN

TYP

MAX

1000

175

UNITS NOTES

t_PB

PBRST = V_IL

RESET Active Time

t_RST

t_ST

250

610

6, 8

ST Pulse Width

t_RPD

100

µs

V_CCFail Detect to RST and RST

V_CCSlew Rate 4.75V to 4.25V

t_F

300

250

µs

t_RPU

610

1000

V_CCDetect to RST and RST Transition

V_CCSlew Rate 4.25V to 4.75V

t_R

µs

t_PDLY

PBRST Stable Low to RST and RST

NOTES:

1. All voltages referenced to ground.

2. Measured with outputs open.

3. PBRST is internally pulled up to V_CCwith an internal impedance of 10k typical.

4. t_R= 5 µs.

5. RST is an open-drain output.

6. Must not exceed t_TDminimum. See Table 1.

7. RST remains within 0.5V of V_CCon power-down until V_CCdrops below 2.0V. RST remains within

0.5V of GND on power-down until V_CCdrops below 2.0V.

8. Watchdog can not be disabled. It must be strobed to avoid resets.

7 of 7

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