DS1621S Maxim Integrated Products, DS1621S Datasheet - Page 11

• Manufacturer Part Number: DS1621S
• Description: IC THERMOMETER/STAT DIG 8-SOIC
• Manufacturer: Maxim Integrated Products

Specifications of DS1621S

• Function: Thermometer, Thermostat
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Full Temp Accuracy: +/- 2 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 12 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 3. DS1621 COMMAND SET
Read Temperature Read last converted temperature
Read Counter
Read Slope
Start Convert T
Stop Convert T
Access TH
Access TL
Access Config
NOTES:
1. In continuous conversion mode a Stop Convert T command will halt continuous conversion. To
2. Writing to the E
INSTRUCTION
restart the Start Convert T command must be issued. In one-shot mode a Start Convert T command
must be issued for every temperature reading desired.
no further writes should be requested for at least 10ms.
2
value from temperature register.
Reads value of Count_Remain
Reads value of the
Count_Per_C
Initiates temperature
conversion.
Halts temperature conversion.
Reads or writes high
temperature limit value into TH
register.
Reads or writes low
temperature limit value into TL
register.
Reads or writes configuration
data to configuration register.
requires a maximum of 10ms at room temperature. After issuing a write command,
TEMPERATURE CONVERSION COMMANDS
DESCRIPTION
THERMOSTAT COMMANDS
11 of 16
PROTOCOL
AAh
ACh
A8h
A9h
EEh
A1h
A2h
22h
2-WIRE BUS DATA
<read 2 bytes data>
AFTER ISSUING
PROTOCOL
<write data>
<write data>
<write data>
<read data>
<read data>
idle
idle
NOTES
1
1
2
2
2