DS2422S Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated
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DS2422S
Dallas Semiconductor -> Maxim Integrated
DS2422S Datasheet PDF : 48 Pages
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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
DS9503
2
5
IO
KDS
SM14J
32768Hz
X1
OSC_TEST
TEST_EXT
IC1 CTLEKS_TT_ECSGT
DS2422
ALARM
PPUUMMPP__OONNZZ
VPAD
BR1225R
Lithium 1
6
IC3
DS9503
2
5
X2
VBAT
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
DS9503
2
5
BR1225R
Lithium 1
6
IC5
DS9503
2
5
IO
KDS
SM14J
32768Hz
X1
OSC_TEST
TEST_EXT
IC1 CTLEKS_TT_ECSGT
DS2422
ALARM
PPUUMMPP__OONNZZ
VPAD
X2
VBAT
GGNNDD
AGND
TEST_SPLY
TEST_RX
CCNNVVSSTT
SCLK
SSDDAATTAA
5V
Leave
open
IC3
INA122
7 V+
R1
470W
D1
1.5V LED
R2
R3
200k
2k
IC2
MAX1086
1 VDD
5 REF
6 CNVST
8 SCLK
7 DOUT
AIN1 2
AIN2 3
GND 4
C1
0.1mF
Thermocouple
Type E, J, K, N
R4
2.2kW
8 RG
1 RG
6 Vo
3 Vin+
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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