DS2422 Ver la hoja de datos (PDF) - Maxim Integrated

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DS2422

1-Wire Temperature/Datalogger with 8KB Datalog Memory

Maxim Integrated 

DS2422

under the control of SCLK. The DS2422 will activate its alarm output if the measured temperature or serial-input

data reaches a user-programmed high or low alarm threshold. This alarm then can be used to shut down the

equipment and enforce a service call. In contrast to microprocessor-based data loggers, the DS2422 does not

require any firmware development. Software for setup and data retrieval through the 1-Wire interface is available

for free download from the iButton website (www.ibutton.com). This software also includes drivers for the serial and

USB port 1-Wire interfaces of a PC, and routines to access the general-purpose memory for storing application or

equipment-specific data files.

Figure 1. Simple Temperature Logger

1-Wire

GND

1

6

IC2

2 DS9503 5

IO

SEIKO

SPT2AF

32768Hz

X1

OSC_TEST

TEST_EXT

IC1 CTLEKS_TT_ECSGT

DS2422

ALARM

PPUUMMPP__OONNZZ

VPVAPADD

BR1225R

Lithium 1

6

IC3

2 DS9503 5

X2

VBBAAT T

GGNNDD

AGND

TEST_SPLY

TEST_RX

CCNNVVSSTT

SCLK

SSDDAATTAA

Leave

open

Figure 2. Temperature and Voltage Logger With Thermocouple

1-Wire

GND

1

6

IC4

2 DS9503 5

BR1225R

Lithium 1

6

IC5

2 DS9503 5

IO

SEIKO

SPT2AF

32768Hz

X1

OSC_TEST

TEST_EXT

IC1 CTLEKS_TT_ECSGT

DS2422

ALARM

PPUUMMPP__OONNZZ

VPVAPADD

X2

VBBAAT T

GGNNDD

AGND

TEST_SPLY

TEST_RX

CCNNVVSSTT

SCLK

SSDDAATTAA

5V

Leave

open

IC3

INA122

7 V+

R1

470

D1

1.5V LED

8 RG

R2

R3

200k

2k

1 RG

6 Vo

IC2

MAX1086

1 VDD

5 REF

6 CNVST

8 SCLK

7 DOUT

AIN1 2

AIN2 3

GND 4

C1

0.1F

Thermocouple

Type E, J, K, N 3 Vin+

R4

2.2k

2 Vin-

5 Ref

4 V-

Note: When using a positive/negative thermocouple, an offset voltage can be utilized through the Ref input of the

INA122 amplifier. This voltage shifts the 0V output of the amplifier up the amount equal to the offset voltage

allowing negative voltages to be read in the positive range of the MAX1086. This offset voltage may be obtained

through a simple resistor divider network (not shown).

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