TCN75-3.3MUA Microchip Technology, TCN75-3.3MUA Datasheet - Page 9

• Manufacturer Part Number: TCN75-3.3MUA
• Description: IC TEMP SENSOR SRL 3.3V 8MSOP
• Manufacturer: Microchip Technology

Specifications of TCN75-3.3MUA

• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Output Type: 2-Wire Serial
• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Temperature Threshold: Programmable
• Full Temp Accuracy: 3 C
• Digital Output - Bus Interface: 2-Wire
• Digital Output - Number Of Bits: 9 bit
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Description/function: 2-Wire Serial Input/Output - Thermal Monitors
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Supply Current: 1 mA
• Ic Output Type: Logic
• Sensing Accuracy Range: ± 0.5°C
• Supply Voltage Range: 2.7V To 5.5V
• Sensor Case Style: MSOP
• No. Of Pins: 8
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Accuracy %: 0.5°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 158-1003; 158-1003

4.3
The TCN75A has four registers that are user-accessi-
ble. These registers are specified as the Ambient
Temperature (T
(T
register and device Configuration (CONFIG) register.
The Ambient Temperature register is a read-only
register and is used to access the ambient temperature
data. The data from the ADC is loaded in parallel in the
register. The Temperature Limit-set and Temperature
Hysteresis registers are read/write registers that
provide user-programmable temperature limits. If the
ambient temperature drifts beyond the programmed
limits, the TCN75A outputs an alert signal using the
ALERT pin (refer to Section 4.3.4.3 “ALERT Output
Configuration”). The device Configuration register
provides access for the user to configure the TCN75A’s
various features. These registers are described in
further detail in the following sections.
REGISTER 4-1:
© 2005 Microchip Technology Inc.
SET
) register, the Temperature Hysteresis (T
Registers
bit 7-3
bit 2-0
A
) register, the Temperature Limit-set
REGISTER POINTER
Unimplemented: Read as ‘0’
Pointer bits
00 = Temperature register
01 = Configuration register
10 = Temperature Hysteresis register
11 = Temperature Limit-set register
Legend:
R = Readable bit
- n = Value at POR
bit 7
U-0
0
U-0
0
HYST
U-0
0
W = Writable bit
‘1’ = Bit is set
)
U-0
0
FIGURE 4-2:
The registers are accessed by sending register
pointers to the TCN75A using the serial interface. This
is an 8-bit pointer. However, the two Least Significant
bits (LSbs) are used as pointers and all other bits need
to be cleared <0>. This device has additional registers
that are reserved for test and calibration. If these
registers are accessed, the device may not perform
according to the specification. The pointer description
is shown below.
Configuration
Temperature
Register
Register
Register
Register
T
T
HYST
SET
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
U-0
Alert Comp/Int
0
Alert Polarity
Fault Queue
Resolution
Shutdown
One-Shot
Register Block Diagram.
U-0
ALERT Output
0
Control Logic
x = Bit is unknown
TCN75A
R/W-0
P1
DS21935A-page 9
ALERT
Output
R/W-0
P0
bit 0