TCN75-3.3MUA Microchip Technology, TCN75-3.3MUA Datasheet - Page 10

• 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
4.3.1
The TCN75A has a 16-bit read-only Ambient
Temperature register that contains 9-bit to 12-bit tem-
perature data. This data is formatted in two’s
complement. The bit assignments, as well as the
corresponding resolution, is shown in the register
assignment below.
The refresh rate of this register depends on the
selected ADC resolution. It takes 30 ms (typ.) for 9-bit
data and 240 ms (typ.) for 12-bit data. Since this
register is double-buffered, the user can read the
register while the TCN75A performs analog-to-digital
REGISTER 4-2:
TABLE 4-1:
DS21935A-page 10
Note 1:
Upper Half:
bit 15
Legend:
R = Readable bit
- n = Value at POR
Note:
Resolution
Sign
R-0
10-Bit
11-Bit
12-Bit
12-Bit
9-Bit
2:
3:
0°C
‘u’ represents unused bits. The TCN75A clears <0> the unused bits.
This data is in two’s complement format, which indicates ambient temperature below 0°C.
Negative temperature magnitude in hexadecimal. This conversion is accomplished by complimenting each binary bit
and adding 1.
AMBIENT TEMPERATURE
REGISTER (T
When the 9-bit, 10-bit or 11-bit resolutions are selected, bit 6, bit 7 or bit 8 will remain clear <0>,
respectively.
2
6
R-0
°C/bit
CODE CONVERSION
Lower Half:
bit 7
2
-1
R-0
AMBIENT TEMPERATURE REGISTER (T
°C/bit
1111 1111 1111 uuuu
TCN75A Output (Binary)
0111 1101 0uuu uuuu
0001 1001 0uuu uuuu
0000 0000 1uuu uuuu
0111 1101 00uu uuuu
0001 1001 01uu uuuu
0000 0000 01uu uuuu
0111 1101 000u uuuu
0001 1001 011u uuuu
0000 0000 001u uuuu
0111 1101 0000 uuuu
0001 1001 0111 uuuu
0000 0000 0001 uuuu
0000 0000 0000 uuuu
1110 0110 1001 uuuu
1100 1001 0000 uuuu
A
2
)
5
R-0
°C/bit
2
-2
R-0
°C/bit
W = Writable bit
‘1’ = Bit is set
2
4
R-0
°C/bit
2
(2)
-3
(1)
R-0
°C/bit
2
3
R-0
°C/bit
2
-4
R-0
Hexadecimal
°C/bit
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
conversion in the background. The decimal code to
ambient
Equation 4-2:
EQUATION 4-2:
Where:
2
001
2
0CB
0FA
3E8
7D0
032
001
1F4
065
001
001
197
001
000
197
370
R-0
°C/bit
(3)
A
)
Code = TCN75A output in decimal
temperature
R-0
0
T
2
A
1
R-0
°C/bit
= Ambient Temperature (°C)
T
(Table 4-1)
A
=
R-0
Decimal
© 2005 Microchip Technology Inc.
0
Code 2
1000
2000
-407
-880
conversion
250
500
101
203
407
2
50
-1
x = Bit is unknown
1
1
1
1
0
0
R-0
°C/bit
bit 8
4 –
R-0
0
is
+25.4375
-25.4375
T
+25.375
+0.0625
-0.0625
+25.25
+0.125
+0.25
A
+125
+125
+125
+125
+0.5
shown
+25
-55
0
(°C)
R-0
0
bit 0
in