EMC1001 Standard Microsystems Corp., EMC1001 Datasheet - Page 10

• Manufacturer Part Number: EMC1001
• Description: Emc1001 1.5?c Smbus Temperature Sensor In Miniature Sot-23
• Manufacturer: Standard Microsystems Corp.

Revision 1.6 (01-29-07)
4.2
Figure 4.2
incorporates switched capacitor technology that integrates the temperature diode ΔV
bias currents. The negative terminal, DN, for the temperature diode is internally biased with a forward
diode voltage referenced to ground.
The advantages of this architecture over Nyquist rate FLASH or SAR converters are superb linearity
and inherent noise immunity. The linearity can be directly attributed to the delta-sigma ADC single-bit
comparator while the noise immunity is achieved by the ~20ms integration time which translates to
50Hz input noise bandwidth.
The 10-bit temperature measurement results are stored in temperature value registers.
shows the two’s complement temperature data format with an LSB equivalent to 0.25
Note 4.1
Note 4.2
The eight most significant bits are stored in the Temperature Value High Byte register and the two least
significant bits stored in the Temperature Value Low Byte register as outlined in
positions of the Temperature Value Low Byte register always read zero. In
Temperature Measurement Results and Data
Remote Diode
Internal or
shows a detailed block diagram of the temperature measurement circuit. The EMC1001
V
Temperature measurement returns 1100 0000 00 for all temperatures ≤ -64.00°C
Temperature measurement returns 0111 1111 11 for all temperatures ≥ +127.75
DD
I
high
TEMPERATURE
Table 4.1 Temperature Data Format
I
+0.25
+0.50
+0.75
Figure 4.2 Detailed Block Diagram
-0.25
+125
low
+1
0.0
Diode
°
Bias
°
°
C
°
°
°
°
C
C
C
C
C
C
I
bias
DATASHEET
Delta Vbe
Sample
Hold
&
1111 1111 11
0000 0000 00
0000 0000 01
0000 0000 10
0000 0000 11
0000 0001 00
0111 1101 00
10
TWO’S COMPLEMENT
–40
VALID RANGE
°
C TO 125
1.5°C SMBus Temperature Sensor in Miniature SOT-23
delta-sigma
Modulator
Note 4.1
Note 4.2
1-bit
°
C
Averaging
Digital
Filter
Table
Table
4.2, the upper case
BE
4.2. The six LSB
°
10-bit Output
SMSC EMC1001
C.
from different
°
Datasheet
Table 4.1
C