DS1726U/T&R [MAXIM]
High-Precision 3-Wire Digital Thermometer and Thermostat;
| 型号： | DS1726U/T&R |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | High-Precision 3-Wire Digital Thermometer and Thermostat |
| 文件： | 总12页 (文件大小：147K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS1626/DS1726
High-Precision 3-Wire Digital
Thermometer and Thermostat
www.maxim-ic.com
DESCRIPTION
FEATURES
digital ꢀ Temperature Measurements Require No
The
DS1626
and
DS1726
thermometers/thermostats provide temperature
External Components
measurements and stand-alone thermostat ꢀ Measure Temperatures from -55°C to
capability over a -55°C to +125°C range. The
DS1626 offers ±0.5°C accuracy from 0°C to
+70°C and the DS1726 has ±1°C accuracy from
-10°C to +85°C. The resolution of the measured
temperature is user selectable from 9 to 12 bits.
Communication with the DS1626 and DS1726 is
achieved through a 3-wire serial bus.
+125°C (-67°F to +257°F)
ꢀ DS1626: ±0.5°C Accuracy from 0°C to
+70°C
ꢀ DS1726: ±1°C Accuracy from -10°C to
+85°C
ꢀ Output Resolution is User Selectable to 9,
10, 11, or 12 Bits
ꢀ Wide Power-Supply Range (2.7V to 5.5V)
ꢀ Convert Temperature to Digital Word in
750ms (max)
ꢀ Stand-Alone Thermostat Capability
ꢀ Thermostatic Settings are User Definable and
Nonvolatile (NV)
ꢀ Data is Read/Written Through a 3-Wire
Serial Interface
ꢀ Available in 8-Pin μSOP Package
The DS1626 and DS1726 offer thermostatic
functionality with three dedicated thermostat
outputs (THIGH
,
TLOW
,
and TCOM), and
overtemperature (TH) and undertemperature (TL)
user-programmable thresholds stored in on-chip
EEPROM. For stand-alone thermostat operation,
TH and TL can be programmed prior to
installation, and the DS1626/DS1726 can be
configured to automatically begin taking
temperature measurements at power-up. Table 1
summarizes the user-accessible registers. Figure
1 shows a functional diagram.
PIN CONFIGURATION
TOP VIEW
8
VDD
1
2
3
APPLICATIONS
Thermostatic Controls
Industrial Controls
DQ
CLK/CNV
RST
DS1626
DS1726
7
6
5
THIGH
TLOW
TCOM
Consumer Products
4
GND
Any Space-Constrained Thermally Sensitive
Application
μSOP
ORDERING INFORMATION
PART
DS1626U
TEMP RANGE
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
PIN-PACKAGE
8 μSOP
8 μSOP
8 μSOP, 3000-Piece
8 μSOP, 3000-Piece
8 μSOP
8 μSOP
8 μSOP, 3000-Piece
8 μSOP, 3000-Piece
TOP MARK
1626
DS1626U+
1626
1626
1626
1726
1726
1726
1726
DS1626U/T&R
DS1626U+T&R
DS1726U
DS1726U+
DS1726U/T&R
DS1726U+T&R
+Denotes a lead-free package. A “+” symbol will also be marked on the package near the Pin 1 indicator.
T&R = Tape and reel.
1 of 12
REV: 071107
DS1626/DS1726
PIN DESCRIPTION
PIN
NAME
FUNCTION
1
DQ
Data Input/Output Pin (Tri-State) for 3-Wire Serial Communication
Clock Input Pin for 3-Wire Serial Communication. Controls temperature
measurements when the DS1626/DS1726 is configured as a stand-alone thermostat.
Reset Input Pin for 3-Wire Serial Communication
2
CLK/CNV
RST
GND
TCOM
TLOW
THIGH
VDD
3
4
5
6
7
8
Ground Pin
Thermostat Output Pin (Push-Pull) with Programmable Hysteresis
Thermostat Output Pin (Push-Pull) with TL Trip Point
Thermostat Output Pin (Push-Pull) with TH Trip Point
Supply Voltage. +2.7V to +5.5V input power pin.
Table 1. DS1626/DS1726 REGISTER SUMMARY
REGISTER NAME
(USER ACCESS)
Temperature
MEMORY
TYPE
REGISTER CONTENTS
AND POWER-UP/POR STATE
Measured Temperature (Two’s Complement)
Power-Up/POR State: -60ºC (1100 0100 0000)
Upper Alarm Trip Point (Two’s Complement)
SIZE
12 Bits
SRAM
(Read Only)
TH
12 Bits
12 Bits
EEPROM Power-Up/POR State: User Defined
Initial State from Factory: +15°C (0000 1111 0000)
(Read/Write)
Lower Alarm Trip Point (Two’s Complement)
EEPROM Power-Up/POR State: User Defined
Initial State from Factory: +10°C (0000 1010 0000)
Configuration and Status Information (Unsigned)
SRAM and 4MSbs = SRAM and 4LSbs = EEPROM
EEPROM Power-Up/POR State: 1000XXXX (XXXX = User
Defined)
TL
(Read/Write)
Configuration
(Various Bits are
Read/Write and Read
Only—See Table 3)
1 Byte
Figure 1. DS1626/DS1726 FUNCTIONAL DIAGRAM
VDD
CONFIGURATION REGISTER AND CONTROL LOGIC
GND
TEMPERATURE SENSOR AND ΔΣ ADC
ADDRESS
and
I/O CONTROL
TEMPERATURE REGISTER
CLK/CNV
SDA
TH REGISTER
DIGITAL
TCOM
THIGH
TLOW
COMPARATOR/LOGIC
RST
TL REGISTER
2 of 12
DS1626/DS1726
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground...................................................................-0.5V to +6.0V
Operating Temperature Range.............................................................................................-55°C to +125°C
Storage Temperature Range ................................................................................................-55°C to +125°C
Solder Dip Temperature (10s) .............................................................................................+260°C
Reflow Oven Temperature ..................................................................................................+220°C
These are stress ratings 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
reliability.
DC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V, TA = -55°C to +125°C.)
PARAMETER
SYMBOL
CONDITIONS
(Note 1)
MIN
2.7
TYP
MAX
5.5
UNITS
Supply Voltage
VDD
V
0°C to +70°C,
3.0V ≤ VDD ≤ 5.5V
0°C to +70°C,
2.7V ≤ VDD < 3.0V
-55°C to +125°C
±0.5
DS1626
Thermometer
Error
TERR
°C
°C
±1.25
±2
(Note 2)
-10°C to +85°C,
3.0V ≤ VDD ≤ 5.5V
-10°C to +85°C,
2.7V ≤ VDD < 3.0V
-55°C to +125°C
±1
DS1726
Thermometer
Error (Note 2)
TERR
±1.5
±2
Low-Level Input
Voltage
High-Level Input
Voltage
Input Current
each Input Pin
VIL
VIH
(Note 1)
-0.5
0.7 x VDD
-10
0.3 x VDD
V
V
(Note 1)
VDD + 0.3
0.4 < VI/O < 0.9 x VDD
+10
1
µA
Temperature conversion
-55°C to +85°C
Temperature conversion
+85°C to +125°C
E2 write
mA
Active Supply
Current (Note 3)
IDD
1.25
400
µA
RST to GND
DQ, CLK to VDD
Input Resistance
RI
1
MΩ
Standby Supply
Current
THIGH, TLOW,
TCOM, DQ
Output Logic
Voltages (Note 1)
Thermal Drift
ISTBY
VOH
0°C to +70°C (Note 3)
1mA source current
1.5
0.4
µA
2.4
V
VOL
4mA sink current
(Note 4)
±0.2
°C
3 of 12
DS1626/DS1726
EEPROM AC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V, TA = -55°C to +125°C.)
PARAMETER
EEPROM Write Cycle Time
EEPROM Writes
SYMBOL CONDITIONS
MIN
TYP
4
MAX UNITS
twr
NEEWR
tEEDR
10
ms
-55°C to +55°C
-55°C to +55°C
50k
10
Writes
Years
EEPROM Data Retention
AC ELECTRICAL CHARACTERISTICS
(VDD = 2.7V to 5.5V, TA = -55°C to +125°C.)
PARAMETER
SYMBOL CONDITIONS
MIN
TYP
MAX UNITS
9 bits
93.75
10 bits
11 bits
187.5
375
Temperature Conversion Time
tTC
ms
12 bits
750
ns
Data In to Clock Setup
Clock to Data In Hold
Clock to Data Out Delay
Clock Low/High Time
Clock Frequency
Clock Rise/Fall Time
RST to Clock Setup
Clock to RST Hold
RST Inactive Time
Clock High to I/O Hi-Z
RST Low to I/O Hi-Z
CNV Pulse Width
tDC
tCDH
tCDD
tCL, tCH
fCLK
tR, tF
tRC
(Note 5)
(Note 5)
(Notes 5, 6)
(Note 5)
(Note 5)
(Note 5)
(Note 5)
(Note 5)
(Note 7)
(Note 5)
(Note 5)
(Note 8)
35
40
ns
150
ns
ns
285
0
1.75
500
MHz
ns
100
40
125
ns
ns
ns
tCRH
tRI
tCDZ
tRDZ
tCNV
CI/O
CI
50
50
ns
ns
250ns
500ms
I/O Capacitance
Input Capacitance
10
5
pF
pF
NOTES:
1) All voltages are referenced to ground.
2) See Figure 2 for TYPICAL OPERATING CURVES.
3) ISTBY, IDD specified with DQ, CLK/CNV = VDD and RST = GND.
4) Drift data is based on a 1000hr stress test at +125°C with VDD = 5.5V.
5) See Timing Diagrams in Figure 3. All timing is referenced to 0.7 x VDD and 0.3 x VDD.
6) Load capacitance = 50pF.
7) tRI must be 10ms minimum following any write command that involves the E2 memory.
8) 250ns is the guaranteed minimum pulse width for a conversion to start, however, a smaller pulse
width may start a conversion.
4 of 12
DS1626/DS1726
Figure 2. TYPICAL OPERATING CURVES
DS1626
DS1726
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-3σ
-0.8
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
+3σ
+3σ
MEAN
MEAN
-3σ
-1
0
10
20
30
40
50
60
70
-10
0
10 20 30 40 50 60 70 80
REFERENCE TEMPERATURE (°C)
REFERENCE TEMPERATURE (°C)
Figure 3. TIMING DIAGRAMS
a) Read Timing
tCRH
tRC
b) Write Timing
tRI
tCRH
tRC
5 of 12
DS1626/DS1726
OPERATION—MEASURING TEMPERATURE
The DS1626/DS1726 measure temperature using a bandgap-based temperature sensor. A delta-sigma
analog-to-digital converter (ADC) converts the measured temperature to a digital value that is calibrated
in degrees Celsius; for Fahrenheit applications a lookup table or conversion routine must be used.
Communication with the DS1626/DS1726 is achieved through a 3-wire serial interface, and all data is
transmitted LSb first.
The DS1626/DS1726 can be programmed to take continuous temperature measurements (continuous
conversion mode) or to take single temperature measurements on command (one-shot mode). The
measurement mode is programmed by the 1SHOT bit in the configuration register as explained in the
CONFIGURATION REGISTER section of this data sheet. The 1SHOT bit is stored in EEPROM, so it can
be programmed prior to installation if desired. In continuous conversion mode, when a Start Convert T
command is issued the DS1626/DS1726 perform consecutive temperature measurements until a Stop
Convert T command is issued. In one-shot mode, the Start Convert T command causes one temperature
measurement to be taken and then the DS1626/DS1726 return to a low-power idle state.
The resolution of the DS1626/DS1726 digital temperature data is user-configurable to 9, 10, 11, or 12
bits, corresponding to temperature increments of 0.5°C, 0.25°C, 0.125°C, and 0.0625°C, respectively.
The resolution is set by the EEPROM R0 and R1 bits in the configuration register. Note that the
conversion time doubles for each additional bit of resolution.
After each temperature measurement and analog-to-digital conversion, the DS1626/DS1726 store the
measured temperature as a two’s complement number in the 12-bit temperature register (see Figure 4).
The sign bit (S) indicates if the temperature is positive or negative: for positive numbers S = 0 and for
negative numbers S = 1. The Read Temperature command provides user access to the temperature
register.
When the DS1626/DS1726 are configured for 12-bit resolution, all 12 bits of the temperature register will
contain temperature data. For 11-bit resolution, the 11 MSbs (bits 11 through 1) of the temperature
register will contain data and bit 0 will read out as 0. Likewise, for 10-bit resolution, the 10 MSbs (bits 11
through 2) will contain data, and for 9-bit the 9 MSbs (bits 11 through 3) will contain data, and all unused
LSbs will contain 0s. Since the DS1626/DS1726 transmit data LSb first, when reading data from the
temperature register, all 12 bits must be read in order to receive all MSbs of the measured data, regardless
of the conversion resolution. Table 2 gives examples of 12-bit resolution digital output data and the
corresponding temperatures.
Figure 4. TEMPERATURE, TH, and TL REGISTER FORMAT
BIT 11
BIT 10
BIT 9
BIT 8
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
S
26
25
24
23
22
21
20
2-1
2-2
2-3
2-4
6 of 12
DS1626/DS1726
Table 2. 12-BIT RESOLUTION TEMPERATURE/DATA RELATIONSHIP
DIGITAL OUTPUT
(BINARY)
DIGITAL OUTPUT
(HEX)
TEMPERATURE (°C)
+125
+25.0625
+10.125
+0.5
0111 1101 0000
0001 1001 0001
0000 1010 0010
0000 0000 1000
0000 0000 0000
1111 1111 1000
1111 0101 1110
1110 0110 1111
1100 1001 0000
7D0h
191h
0A2h
008h
000h
FF8h
F5Eh
E6Fh
C90h
0
-0.5
-10.125
-25.0625
-55
OPERATION—THERMOSTAT FUNCTION
The DS1626/DS1726 thermostat outputs (THIGH, TLOW, and TCOM) are updated after every temperature
conversion and remain at the updated values until the next conversion completes. THIGH is asserted when
the measured temperature is higher than or equal to the value stored in the TH register, and TLOW is
asserted when the temperature is equal to or falls below the value in the TL register (see Figure 5). TCOM
uses both TH and TL to provide programmable hysteresis: when the measured temperature equals or
exceeds TH, TCOM is asserted and it remains asserted until the temperature falls to a value equal to or
below TL. All three thermostat outputs are active-high outputs.
The Write TH and Write TL commands are used to program the 12-bit TH and TL registers with user-
defined two’s complement values. The MSb (bit 11) of each register contains the two’s complement sign
bit (S). For the TCOM thermostat output to function correctly, the TL value must be less than the TH value.
Any unused LSbs in the TH and TL registers are forced to 0 regardless of the data written to those bits.
The unused LSbs are determined by the conversion resolution set by R1 and R0 in the configuration
register. Therefore, for 9-bit conversions bits 2 through 0 will be 0, for 10-bit conversions bit 1 and bit 0
will be 0, and for 11-bit conversions bit 0 will be 0. All bits are used for 12-bit conversions, so no bits are
forced to 0. However, regardless of the conversion resolution, when writing to TH or TL at least 12 bits
must be sent following the Write TH or Write TL commands. The reason is that data written to TH and TL
is not saved to EEPROM until the DS1626/DS1726 have received 12 bits, so if the operation is
terminated before 12 bits have been received, the data will be lost. Any additional bits sent after the first
twelve are ignored (e.g., if two 8-bit words are written).
Another DS1626/DS1726 thermostat feature is the temperature-high flag (THF) and temperature-low flag
(TLF) in the configuration register. These bits provide a record of whether the temperature has been
greater than or equal to TH or less than or equal to TL at any time since the DS1626/DS1726 were
powered up. If the temperature is greater than or equal to the TH register value, the THF bit in the
configuration register will be set to 1. If the temperature is less than or equal to the TL register value, the
TLF bit in the configuration register will be set to 1. Once THF and/or TLF has been set, it will remain
set until the user overwrites it with a 0 or until the power is cycled.
7 of 12
DS1626/DS1726
CPU BIT AND STAND-ALONE THERMOSTAT OPERATION
In stand-alone thermostat mode, DS1626/DS1726 thermostat functionality can be used without requiring
a microcontroller to start/stop temperature conversions. The CPU bit in the configuration register
determines if stand-alone mode is enabled.
When CPU = 1 stand-alone mode is disabled, and the only way to start/stop temperature conversions is
by using a microcontroller to transmit Start Convert T and Stop Convert T commands, respectively.
Stand-alone mode is enabled when CPU = 0. In this mode, when RST = 0 the CLK/CNV pin operates as
a control signal to start and stop temperature measurements. Driving CLK/CNV low initiates continuous
temperature conversions that will continue until CLK/CNV is brought high again. If the CLK/CNV pin is
driven low and then returned to a high state in less than 10ms, only one temperature conversion will be
performed after which the DS1626/DS1726 will return to a low-power idle state (i.e., one-shot operation).
Note that when stand-alone mode is enabled, the 1SHOT bit in the configuration register is ignored, and
only the CLK/CNV signal determines whether continuous or one-shot conversions take place.
Since TH, TL, and the CPU bit are stored in EEPROM, the DS1626/DS1726 can be preprogrammed for
stand-alone operation. If desired, the CLK/CNV and RST pin can be connected to GND so the
DS1626/DS1726 will automatically begin taking temperature measurements at power-up
Normal bus communication with the DS1626/DS1726 can still take place in stand-alone mode when
RST = 1. When communication is initiated, stand-alone conversions are automatically halted. If during
the bus communication continuous temperature conversions are started using the Start Convert T
command, they can only be stopped by issuing a Stop Convert T command.
Figure 5. THERMOSTAT OUTPUT OPERATION
TH
TL
LOGIC 1
TCOM
LOGIC 0
TEMP
LOGIC 1
THIGH
LOGIC 0
TEMP
TEMP
LOGIC 1
TLOW
LOGIC 0
8 of 12
DS1626/DS1726
CONFIGURATION REGISTER
The configuration register allows the user to customize the DS1626/DS1726 conversion and thermostat
options. It also provides information to the user about conversion status, EEPROM activity, and
thermostat activity. The configuration register is arranged as shown in Figure 6 and detailed descriptions
of each bit are provided in Table 3. This register can be accessed using the Read Config and Write Config
commands. Note that the R1, R0, CPU, and 1SHOT bits are stored in EEPROM and all other
configuration register bits are SRAM.
Figure 6. CONFIGURATION REGISTER
MSb
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
LSb
DONE
THF
TLF
NVB
R1*
R0*
CPU* 1SHOT*
*NV (EEPROM)
Table 3. CONFIGURATION REGISTER BIT DESCRIPTIONS
BIT NAME
(USER ACCESS)
FUNCTIONAL DESCRIPTION
Power-up state = 1.
DONE
DONE = 0. Temperature conversion is in progress.
(Read Only)
DONE = 1. Temperature conversion is complete.
Power-up state = 0.
THF
THF = 1. The measured temperature has reached or exceeded the value stored in the
(Read/Write)
TH register. THF will remain a 1 until it is overwritten with a 0 by the user, the
power is cycled, or a Software POR command is issued.
Power-up state = 0.
TLF
(Read/Write)
TLF = 1. The measured temperature has equaled or dropped below the value stored
in the TL register. TLF will remain a 1 until it is overwritten with a 0 by the user, the
power is cycled, or a Software POR command is issued.
Power-up state = 0.
NVB
(Read Only)
NVB = 1. Write to an E2 memory cell is in progress.
NVB = 0. NV memory is not busy.
Power-up state = last value written to this bit.
Sets conversion resolution (see Table 4).
Initial state from factory = 1.
R1*
(Read/Write)
Power-up state = last value written to this bit.
Sets conversion resolution (see Table 4).
Initial state from factory = 1.
R0*
(Read/Write)
Power-up state = last value written to this bit.
CPU = 1. Stand-alone mode is disabled.
CPU*
(Read/Write)
CPU = 0. Stand-alone mode is enabled when RST = 0. See CPU BIT AND STAND-
ALONE THERMOSTAT OPERATION section for more information.
Initial state from factory = 0.
Power-up state = last value written to this bit.
1SHOT = 1: One-Shot Mode. The Start Convert T command initiates a single
temperature conversion and then the device goes into a low-power standby state.
1SHOT = 0: Continuous Conversion Mode. The Start Convert T command initiates
continuous temperature conversions.
1SHOT*
(Read/Write)
Initial state from factory = 0.
*NV (EEPROM)
9 of 12
DS1626/DS1726
Table 4. RESOLUTION CONFIGURATION
CONVERSION
TIME (MAX)
(ms)
RESOLUTION
R1
R0
(BITS)
0
0
1
1
0
1
0
1
9
93.75
187.5
375
750
10
11
12
3-WIRE SERIAL DATA BUS
The 3-wire bus consists of three signals: RST (active-low reset), CLK (clock), and DQ (data). 3-wire
communication is controlled by the RST signal, which functions as “chip select” signal. All data is
transferred LSb first over the 3-wire bus. All communication with the DS1626/DS1726 is initiated by
driving RST high. Driving RST low terminates communications and causes DQ to go to a high-
impedance state. Note that RST must be toggled low after every communication sequence to ensure that
subsequent commands are recognized by the DS1626/DS1726.
When writing to the DS1626/DS1726, data must be valid during the rising edge of CLK. During read
operations the DS1626/DS1726 output data on DQ on the falling edge of CLK and the data remains valid
through the following rising edge, at which time the DQ pin becomes high impedance until the next
falling edge.
To communicate with the DS1626/DS1726, the master must first drive RST high and then begin
generating the CLK signal while transmitting the desired DS1626/DS1726 command byte. If the
command is a Start Convert T, Stop Convert T, or Software POR command, the transaction is finished
when the last bit of the command has been sent. Figure 7a illustrates a Start Convert T command
sequence.
When writing to the DS1626/DS1726, the master must begin transmitting data during the clock cycle
immediately following the command byte. The DS1626/DS1726 will save only the number of data bits
needed for the specific transaction. For example, for the Write TH or Write TL commands, after twelve
bits of data have been transmitted by the master, the DS1626/DS1726 will ignore any subsequent data
transmitted before RST goes low. Thus, if data is being transmitted in byte-length segments, the
DS1626/DS1726 will load the first twelve bits into the TH/TL register, and the next four bits will be
ignored. On the other hand, it is necessary to transmit at least the required number of bits for the
requested transaction (i.e., 12-bits to TH/TL or 8-bits to the configuration register), because the
DS1626/DS1726 will not save data until the expected number of bits have been received. Write TH and
Write TL sequences are illustrated in Figure 7b and a Write Config sequence is shown in Figure 7c. Note
that these figures assume byte-wide data transfers.
When reading data from the DS1626/DS1726, the DS1626/DS1726 will begin sending data during the
clock cycle immediately following the command byte. After the last data byte has been sent, the
DS1626/DS1726 will transmit a 0 during each subsequent clock until RST goes low. Figure 7d illustrates
a Read Temperature sequence and a Read Config transaction is shown in Figure 7e. The sequence for
reading the TH or TL registers is the same as the Read Temp transaction in Figure 7d except that the Read
TH or Read TL command is used.
10 of 12
DS1626/DS1726
Figure 7. 3-WIRE COMMUNICATION
a) Start Temperature Conversion
RST
CLK
DQ
1
0
0
0
1
0
1
0
Start Convert T [51h] Command
b) Write to the TH/TL Registers
⋅ ⋅ ⋅
⋅ ⋅ ⋅
RST
CLK
DQ
0
0
C0 C1
0
0
0
0
D0 D1 D2 D3
D4
D5
D6
D7
D8 D9 D10 D11
Write TH [01h] or TL [02h] Command
TH or TL Data from Master
c) Write to the Configuration Register
RST
CLK
DQ
0
0
1
1
0
0
D0 D1
D5 D6 D7
0
0
D2 D3
D4
Write Config [0Ch] Command
Configuration Reg. Data from Master
d) Read from the Temperature Register
⋅ ⋅ ⋅
RST
CLK
⋅ ⋅ ⋅
⋅ ⋅ ⋅
D0
D1
D2 D3
D4 D5 D6 D7
D8
D
10
D
11
DQ
D9
0
1
0
1
0
1
0
1
0
0
0
Read Temperature [AAh] Command
Temperature Data from DS1626/DS1726
e) Read from the Configuration Register
RST
CLK
DQ
0
0
1
1
0
1
D0
D1
D5
D7
0
1
D2 D3 D4
D6
Read Config [ACh] Command
Configuration Reg. Data from DS1626/DS1726
11 of 12
DS1626/DS1726
DS1626/DS1726 COMMAND SET
The DS1626/DS1726 command set is detailed below:
Start Convert T
51h
0101 0001
Initiates temperature conversions. If the DS1626/DS1726 are in one-shot mode (1SHOT = 1), only one
conversion will be performed. If the devices are in continuous mode (1SHOT = 0), continuous
conversions will be performed until a Stop Convert T command is issued.
Stop Convert T
22h
0010 0010
Stops temperature conversions when the devices are in continuous conversion mode (1SHOT = 0).
Read Temperature AAh 1010 1010
Reads the last converted temperature value from the temperature register.
Read TH
Reads the 12-bit TH register.
A1h
A2h
01h
02h
ACh
1010 0001
1010 0010
0000 0001
0000 0010
1010 1100
0000 1100
0101 0100
Read TL
Reads the 12-bit TL register.
Write TH*
Writes the 12-bit TH register.
Write TL*
Writes the 12-bit TL register.
Read Config
Reads the 1-byte configuration register.
Write Config* 0Ch
Writes the 1-byte configuration register.
Software POR 54h
Initiates a software power-on reset (POR), which stops temperature conversions and resets all registers
and logic to their power-up states. The software POR allows the user to simulate cycling the power
without actually powering down the device.
*After issuing a write command, no further writes should be requested for at least 10ms due to the EEPROM write cycle time.
PACKAGE INFORMATION
For the latest package outline information, go to www.maxim-ic.com/packages.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
21-0036
—
8 μSOP
12 of 12
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