DS1822+ Maxim Integrated Products, DS1822+ Datasheet - Page 14

• Manufacturer Part Number: DS1822+
• Description: Board Mount Temperature Sensors IC THERMOMETER ECONO DIG
• Manufacturer: Maxim Integrated Products

Specifications of DS1822+

• Temperature Threshold: Programmable
• Full Temp Accuracy: +/- 2 C
• Package / Case: TO-92
• Digital Output - Bus Interface: 1-Wire
• Digital Output - Number Of Bits: 9 bit to 12 bit
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Output Type: Digital
• Supply Current: 1.5 mA
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 2°C
• Supply Voltage Range: 3V To 5.5V
• Resolution (bits): 12bit
• Sensor Case Style: TO-92
• No. Of Pins: 3
• Accuracy %: 2°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS1822 FUNCTION COMMANDS FLOW CHART Figure 12
MASTER T
FUNCTION
COMMAND
MASTER
R
X
TEMPERATURE
DS1822 BEGINS
N
CONVERTING
N
“1s”
CONVERSION
MASTER
DEVICE
R
Y
X
X
POWER SUPPLY
?
“0s”
POWERED
PARASITE
READ
B4h
?
?
Y
N
N
TEMPERATURE
MASTER
R
MASTER
Y
CONVERT
R
PARASITE
X
POWER
X
“0s”
“1s”
44h
?
?
Y
STRONG PULLUP ON DQ
Y
N
DS1822 CONVERTS
MASTER DISABLES
MASTER ENABLES
STRONG PULLUP
TEMPERATURE
N
RECALL FROM E
MASTER BEGINS DATA
BUSY RECALLING
RECALL E
MASTER
DEVICE
R
SEQUENCE (FIGURE 11) FOR
Y
DATA
RETURN TO INITIALIZATION
B8h
X
?
?
“0s”
NEXT TRANSACTION
Y
2
2
PROM
14 of 21
N
MASTER
R
X
“1s”
PROGRESS
Y
COPY IN
MASTER
R
X
N
MASTER R
N
?
“0s”
MASTER R
FROM SCRATCHPAD
SCRATCHPAD
HAVE 8 BYTES
N
BEEN READ
CRC BYTE
T
MASTER
X
READ
X
RESET
BEh
SCRATCHPAD
X
?
?
?
SCRATCHPAD
N
DATA BYTE
Y
N
Y
PARASITE
POWER
MASTER
COPY
R
48h
X
?
?
“1s”
Y
Y
SCRATCHPAD TO EEPROM
STRONG PULL-UP ON DQ
N
DATA COPIED FROM
Y
MASTER DISABLES
MASTER ENABLES
STRONG PULLUP
MASTER T
N
MASTER T
MASTER T
TO SCRATCHPAD
TO SCRATCHPAD
TO SCRATCHPAD
SCRATCHPAD
WRITE
X
4Eh
CONFIG. BYTE
?
X
X
T
T
Y
H
L
DS1822
BYTE
BYTE