TCN75-3.3MUA Microchip Technology, TCN75-3.3MUA Datasheet - Page 8

• 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

TCN75A
4.0
The TCN75A temperature sensor consists of a band-
gap type temperature sensor, a
Converter (ADC), user-programmable registers and a
2-wire I
FIGURE 4-1:
DS21935A-page 8
Register
Pointer
2
C protocol-compatible serial interface.
FUNCTIONAL DESCRIPTION
Configuration
Temperature
Register
Register
Register
Register
T
T
HYST
SET
Alert Comp/Int
Alert Polarity
Fault Queue
Resolution
Functional Block Diagram.
Shutdown
One-Shot
Interface
I
2
C™
Analog-to-Digital
Temperature
Band-Gap
Sensor
10-Bit
11-Bit
12-Bit
9-Bit
ADC
4.1
The TCN75A uses the difference in the base-emitter
voltage of a transistor while its collector current is
changed from IC
depends only on the ratio of the two currents and the
ambient temperature, as shown in Equation 4-1.
EQUATION 4-1:
4.2
A sigma-delta ADC is used to convert V
word that corresponds to the transistor temperature.
The converter has an adjustable resolution from 9-bits
(at 30 ms conversion time) to 12-bits (at 240 ms conver-
sion time). Thus, it allows the user to make trade-offs
between resolution and conversion time. Refer to
Section 4.3.4
(CONFIG)” and Section 4.3.4.7 “
for details.
Where:
IC
1
and IC
Temperature Sensor
V
BE
Analog-to-Digital Converter
T = temperature in kelvin
q = electron charge
k = Boltzmann's constant
2
V
BE
“Sensor
= change in diode base-emitter
= currents with n:1 ratio
1
to IC
=
voltage
⎛
⎝
kT
----- -
q
© 2005 Microchip Technology Inc.
2
. With this method, the V
⎞
⎠
Configuration
ln IC
1
ADC Resolution”
IC
2
BE
to a digital
Register
BE