DS1620 Maxim Integrated Products, DS1620 Datasheet - Page 5

• Manufacturer Part Number: DS1620
• Description: IC THERMOMETER/STAT DIG 8-DIP
• Manufacturer: Maxim Integrated Products

Specifications of DS1620

• Function: Thermometer, Thermostat
• Topology: Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: Digital
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Full Temp Accuracy: +/- 2 C
• Digital Output - Bus Interface: Serial (3-Wire)
• Digital Output - Number Of Bits: 9 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

THERMOSTAT OUTPUT OPERATION Figure 3
OPERATION AND CONTROL
The DS1620 must have temperature settings resident in the TH and TL registers for thermostatic
operation. A configuration/status register also determines the method of operation that the DS1620 will
use in a particular application and indicates the status of the temperature conversion operation. The
configuration register is defined as follows:
CONFIGURATION/STATUS REGISTER
where
DONE = Conversion Done Bit. 1=conversion complete, 0=conversion in progress. The power-up/POR
state is a 1.
THF
to the value of TH. It will remain 1 until reset by writing 0 into this location or by removing power from
the device. This feature provides a method of determining if the DS1620 has ever been subjected to
temperatures above TH while power has been applied. The power-up/POR state is a 0.
TLF
the value of TL. It will remain 1 until reset by writing 0 into this location or by removing power from the
device. This feature provides a method of determining if the DS1620 has ever been subjected to
temperatures below TL while power has been applied. The power-up/POR state is a 0.
NVB
memory is not busy. A copy to E
CPU
low. If CPU is 1, the DS1620 will be used with a CPU communicating to it over the 3–wire port, and the
operation of the CLK/
nonvolatile E
DONE
= Temperature High Flag. This bit will be set to 1 when the temperature is greater than or equal
= Temperature Low Flag. This bit will be set to 1 when the temperature is less than or equal to
= Nonvolatile Memory Busy Flag. 1=write to an E
= CPU Use Bit. If CPU=0, the CLK/
2
THF
memory, capable of at least 50,000 writes. The DS1620 is shipped with CPU=0.
CONV
TLF
T
T
T
pin is as a normal clock in concert with DQ and
HIGH
COM
LOW
2
may take up to 10 ms. The power-up/POR state is a 0.
NVB
TL
1
CONV
5 of 12
pin acts as a conversion start control, when
0
TH
2
memory cell in progress. 0=nonvolatile
CPU
T(°C)
1SHOT
RST
. This bit is stored in
RST
is