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DS1624

P1-P3P4-P6P7-P9P10-P12P13-P14
General Description
The DS1624 consists of two separate functional units: a
256-byte nonvolatile E
2
memory and a direct-to-digital
temperature sensor.
The nonvolatile memory is made up of 256 bytes of E
2
memory. This memory can be used to store any type of
information the user wishes. These memory locations are
accessed through the 2-wire serial bus.
The direct-to-digital temperature sensor allows the
DS1624 to measure the ambient temperature and report
the temperature in a 12-bit word with 0.0625°C resolu-
tion. The temperature sensor and its related registers are
accessed through the 2-wire serial interface. Figure 1
shows a block diagram of the DS1624.
Benets and Features
● Reduces Component Count with Integrated
Temperature Sensor and Nonvolatile E
2
Memory
• Measures Temperatures from -55°C to +125°C in
0.0625°C Increments
• ±0.5°C Accuracy from 0°C to 70°C
• 256 Bytes of E
2
Memory for Storing Information
Such as Frequency Compensation Coefcients
• No External Components
● Easy-to-Use 2-Wire Serial Interface
• Temperature is Read as a 12-Bit Value
(2-Byte Transfer)
● Available in 8-Pin SO and DIP Packages
Ordering Information appears at end of data sheet.
19-6288; Rev 5; 8/15
Figure 1. Block Diagram
STATUS REGISTER AND
CONTROL LOGIC
TEMPERATURE
SENSOR
EEPROM MEMORY
(256 BYTES)
V
DD
GND
SCL
SDA
A0
A1
A2
DS1624
ADDRESS AND
I/O CONTROL
DS1624 Digital Thermometer and Memory
Voltage Range on Any Pin Relative to Ground ....-0.5V to +6.0V
Continuous Power Dissipation (T
A
= +70°C)
PDIP (derate 9.10mW/°C above +70°C) ................727.30mW
Operating Temperature Range ......................... -55°C to +125°C
Storage Temperature Range ............................ -55°C to +125°C
Soldering Temperature (reflow) ....................................... +260°C
Lead Temperature (soldering, 10s) .................................+300°C
PDIP
Junction-to-Ambient Thermal Resistance (θ
JA
) ........110°C/W Junction-to-Case Thermal Resistance (θ
JC
) ...............40°C/W
(Note 1)
(V
DD
= 2.7V to 5.5V, T
A
= -55°C to +125°C, unless otherwise noted.) (Note 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
DD
(Note 2) 2.7 5.0 5.5 V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Thermometer Error T
ERR
0°C to +70°C ±0.5
°C
-55°C to +125°C ±2.0
Thermometer Resolution 12-bit 0.0625 °C
Low-Level Input Voltage V
IL
-0.3 0.3 x V
DD
V
High-Level Input Voltage V
IH
0.7 x V
DD
V
DD
+ 0.3 V
Pulse Width of Spikes That Must
Be Suppressed by the Input Filter
t
SP
Fast mode 0 50 ns
Low-Level Output Voltage (SDA)
V
OL1
3mA sink current (Note 2) 0 0.4
V
V
OL2
6mA sink current (Note 2) 0 0.6
Input Current Each I/O Pin 0.4 < V
I/O
< 0.9V
DD
(Note 4) -1 +1 µA
I/O Capacitance C
I/O
10 pF
Active Supply Current I
CC
Temperature conversion 1250
µAE
2
write (Notes 5, 6) 400
Communication only 125
Standby Supply Current I
STBY
(Notes 5, 6, 7) 1 3 µA
DS1624 Digital Thermometer and Memory
www.maximintegrated.com
Maxim Integrated
│
2
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Absolute Maximum Ratings
This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect device reliability.
Package Thermal Characteristics
DC Electrical Characteristics
Recommended Operating Conditions
(V
DD
= 2.7V to 5.5V, T
A
= -55°C to +125°C, unless otherwise noted. All values referred to V
IH
= 0.9V
DD
and V
IL
= 0.1V
DD
.)
Note 2: All voltages are referenced to ground.
Note 3: Limits are 100% production tested at T
A
= +25°C and/or T
A
= +85°C. Limits over the operating temperature range and
relevant supply voltage are guaranteed by design and characterization.
Note 4: I/O pins of fast mode devices must not obstruct the SDA and SCL lines if V
DD
is switched off.
Note 5: I
CC
specified with SDA pin open.
Note 6: I
CC
specified with V
CC
at 5.0V and SDA, SCL = 5.0V, 0°C to +70°C.
Note 7: EEPROM inactive, temperature sensor in shutdown mode.
Note 8: For example, if CB = 300pF, then t
R(MIN)
= t
F(MIN)
= 50ns.
Note 9: Write occurs between 0°C and +70°C.
Note 10: See the timing diagram (Figure 2). All timing is referenced to 0.9V
DD
and 0.1V
DD
.
Note 11: After this period, the first clock pulse is generated.
Note 12: A fast mode device can be used in a standard mode system, but the requirement t
SU:DAT
≥ 250ns must then be met. This
is automatically the case if the device does not stretch the low period of the SCL signal. If such a device does stretch the
low period of the SCL signal, it must output the next data bit to the SDA line t
R(MAX)
+ t
SU:DAT
= 1000 + 250 = 1250ns
before the SCL line is released.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Temperature Conversion Time t
TC
200 ms
EEPROM Write Cycle Time t
WR
0°C to +70°C (Note 8) 50 ms
EEPROM Endurance N
EEWR
-20°C to +70°C
(Note 9)
10k 20k
Write
Cycles
T
A
= +25°C 40k 80k
EEPROM Data Retention t
EEDR
-40°C to +70°C 10 20 Years
SLK Clock Frequency f
SCL
Fast mode
(Note 10)
0 400
kHz
Standard mode 0 100
Bus Free Time Between a STOP
and START Condition
t
BUF
Fast mode
(Note 10)
1.3
µs
Standard mode 4.7
Hold Time (Repeated)
START Condition
t
HD:STA
Fast mode
(Notes 10, 11)
0.6
µs
Standard mode 4.0
Low Period of SCL Clock t
LOW
Fast mode
(Note 10)
1.3
µs
Standard mode 4.7
High Period of SCL Clock t
HIGH
Fast mode
(Note 10)
0.6
µs
Standard mode 4.0
Setup Time for a Repeated START
Condition
t
SU:STA
Fast mode
(Note 10)
0.6
µs
Standard mode 4.7
Data Hold Time t
HD:DAT
Fast mode
(Note 10)
0 0.9
µs
Standard mode 0 0.9
Data Setup Time t
SU:DAT
Fast mode
(Notes 10, 11,
12)
100
ns
Standard mode 250
Rise Time of Both SDA and SCL
Signals
t
R
Fast mode
(Notes 8, 10, 12)
20 + 0.1C
B
300
ns
Standard mode 20 + 0.1C
B
1000
Fall Time of Both SDA and SCL
Signals
t
F
Fast mode
(Notes 8, 10, 12)
20 + 0.1C
B
300
ns
Standard mode 20 + 0.1C
B
300
Setup Time for STOP Condition t
SU:STO
Fast mode
(Note 10)
0.6
µs
Standard mode 4.0
Capacitive Load for Each Bus Line C
B
400 pF
Input Capacitance C
I
5 pF
DS1624 Digital Thermometer and Memory
www.maximintegrated.com
Maxim Integrated
│
3
AC Electrical Characteristics
P1-P3P4-P6P7-P9P10-P12P13-P14

DS1624

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SENSOR DIGITAL -55C-125C 8DIP
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