DS75LXU+T&R Maxim Integrated Products, DS75LXU+T&R Datasheet - Page 8

• Manufacturer Part Number: DS75LXU+T&R
• Description: IC THERMOMETER/STAT DIG 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of DS75LXU+T&R

• 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: No
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Full Temp Accuracy: +/- 3 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: Lead free / RoHS Compliant

Table 2. Configuration Register Bit Descriptions
Table 3. Resolution Configuration
Table 4. Fault Tolerance Configuration
REGISTER POINTER
The four DS75LX registers each have a unique two-bit pointer designation, which is defined in Table 5. When
reading from or writing to the DS75LX, the user must “point” the DS75LX to the register that is to be accessed.
When reading from the DS75LX, once the pointer is set it remains pointed at the same register until it is changed.
For example, if the user wants to perform consecutive reads from the temperature register, the pointer only has to
be set to the temperature register one time, after which all reads will automatically be from the temperature register
until the pointer value is changed. On the other hand, when writing to the DS75LX, the pointer value must be
refreshed each time a write is performed, even if the same register is being written to twice in a row.
At power-up, the default pointer value is the temperature register so the temperature register can be read
immediately without resetting the pointer.
Changes to the pointer setting are accomplished as described in the 2-Wire Serial Data Bus.
0
Reserved
R1
Conversion Resolution Bit 1
R0
Conversion Resolution Bit 0
F1
Thermostat Fault Tolerance Bit 1
F0
Thermostat Fault Tolerance Bit 0
POL
Thermostat Output (O.S.) Polarity
TM
Thermostat Operating Mode
SD
Shutdown
R1
F1
0
0
1
1
0
0
1
1
R0
F0
0
1
0
1
0
1
0
1
BIT NAME
RESOLUTION (BITS)
THERMOMETER
CONVERSIONS TO TRIGGER O.S.
CONSECUTIVE OUT-OF-LIMITS
10
11
12
9
1
2
4
6
Power-Up State = 0
The master can write to this bit, but it always reads out as a 0.
Power-Up State = 0
Sets conversion resolution (see Table 3).
Power-Up State = 0
Sets conversion resolution (see Table 3).
Power-Up State = 0
Sets the thermostat fault tolerance (see Table 4).
Power-Up State = 0
Sets the thermostat fault tolerance (see Table 4).
Power-Up State = 0
POL = 0 — O.S. is active low.
POL = 1 — O.S. is active high.
Power-Up State = 0
TM = 0 — Comparator mode.
TM = 1 — Interrupt mode.
See the Operation—Thermostat section for a detailed description of
these modes.
Power-Up State = 0
SD = 0 — Active conversion and thermostat operation.
SD = 1 — Shutdown mode.
See the Shutdown Mode section for a detailed description of this mode.
DS75LX: Digital Thermometer and Thermostat with Extended Addressing
MAX CONVERSION
TIME (ms)
100
200
8 of 13
25
50
DESCRIPTION