TCN75AVOA Microchip Technology, TCN75AVOA Datasheet - Page 15

• Manufacturer Part Number: TCN75AVOA
• Description: IC TEMP SENSOR SRL 2.7V 8SOIC
• Manufacturer: Microchip Technology

Specifications of TCN75AVOA

• Package / Case: 8-SOIC (3.9mm Width)
• Output Type: I²C™
• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Alarm: No
• Output Fan: Yes
• 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, I2C
• Digital Output - Number Of Bits: 9 bit to 12 bit
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 55 C
• Supply Current: 500 uA
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 2°C
• Temperature Sensing Range: -40°C To +125°C
• Supply Voltage Range: 2.7V To 5.5V
• Resolution (bits): 12bit
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

4.3.4.6
The fault queue feature can be used as a filter to lessen
the probability of spurious activation of the ALERT pin.
T
ber of conversion cycles selected using the Fault
Queue bits. Bit 3 and bit 4 of CONFIG can be used to
select up to six fault queue cycles. For example, if six
fault queues are selected, T
T
asserted as a comparator or an interrupt output.
This queue setting also applies for T
queues are selected,T
six consecutive conversions before ALERT is deas-
serted (Comparator mode) or before another interrupt
is asserted (Interrupt mode).
4.3.4.7
The TCN75A provides access to select the ADC
resolution from 9-bit to 12-bit using bit 6 and bit 5 of the
CONFIG register. The user can gain better insight into
the trends and characteristics of the ambient
temperature by using a finer resolution. Increasing the
resolution also reduces the quantization error.
Figure 2-4 shows accuracy versus resolution.
Table 4-1 shows the T
corresponding resolution.
TABLE 4-1:
© 2005 Microchip Technology Inc.
A
SET
must remain above T
Bits
for six consecutive conversions before ALERT is
10
11
12
9
Fault Queue
ADC Resolution
°C/bit (typ.)
Resolution
RESOLUTION AND
CONVERSION TIME
0.0625
0.125
0.25
A
0.5
A
register conversion time for the
must remain below T
SET
for the consecutive num-
A
must be greater than
HYST
t
CONV
120 ms
240 ms
30 ms
60 ms
.
I
f six fault
(typ.)
HYST
for
4.4
The TCN75A has an internal Power-on Reset (POR)
circuit. If the power supply voltage V
to the 1.7V (typ.) threshold, the device resets the
registers to the power-up default settings.
Table 4-2 shows the power-up default summary.
TABLE 4-2:
At power-up, the TCN75A has an inherent 2 ms (typ.)
power-up delay before updating the registers with
default values and start a conversion cycle. This delay
reduces register corruption due to unsettled power.
After power-up, it takes t
update the T
Register
CONFIG
Pointer
T
T
HYST
T
SET
Summary of Power-up Condition
A
A
register with valid temperature data.
POWER-UP DEFAULTS
(Hex)
A000
Data
0000
9600
00
00
CONV
Continuous Conversion
Temperature register
Power-up Defaults
Comparator mode
Active-low Output
TCN75A
9-bit Resolution
for the TCN75A to
Fault Queue 1
DS21935A-page 15
DD
80°C
75°C
0°C
glitches down