EMC1053 Standard Microsystems Corp., EMC1053 Datasheet - Page 12

• Manufacturer Part Number: EMC1053
• Description: 1 Degree C Triple Temperature Sensor With Resistance Error Correction & Hotter Of Two Zones
• Manufacturer: Standard Microsystems Corp.

Revision 1.44 (04-14-08)
3.3.1
3.3.2
3.4
1 / sec
2 / sec
4 / sec
8 / sec
16 / sec
CONVERSION RATE
Δ
V
BE
Conversion Rates
The EMC1053 may be configured for different conversion rates based on the system requirements.
The available rates are 1 full set of conversions per second to 16 full sets of conversions per second.
The conversion rate is configured as described in
shown in
Dynamic Averaging
The EMC1053 temperature channels support a new feature that measures the external diode channels
for an extended time based on the selected conversion rate. This functionality can be disabled as
described in
Averaging is enabled, the device will automatically adjust the sampling and measurement time for both
external diode channels. This allows the device to average 2x or 4x longer than the normal 11 bit
operation while still maintaining the selected conversion rate. The benefits of Dynamic Averaging are
improved noise rejection due to the longer integration time as well as less random variation on the
temperature measurement.
The Dynamic Averaging applies when a One-Shot command is issued. The device will perform the
desired averaging during the one-shot operation according to the selected conversion rate.
The Dynamic Averaging will affect the average supply current based on the chosen conversion rate
as shown in
In general, thermal diode temperature measurements are based on the change in forward bias voltage
of a diode when operated at two different currents. This ΔV
temperature as shown in the following equation:
Temperature Monitors
=
V
Table 3.1 Supply Current vs. Conversion Rate and ADC Averaging Factor
BE
_
HIGH
Table
Table
Section 4.5
−
190uA
315uA
580uA
N/A
N/A
4.4.
V
BE
3.1.
_
(MAX_RES = 1)
LOW
(DA_N = 0)
1°C Triple Temperature Sensor with Resistance Error Correction & Hotter of Two Zones
for increased power savings at the lower conversion rates. When Dynamic
=
4X
η
kT
q
ln
DATASHEET
⎛
⎜ ⎜
⎝
I
I
HIGH
LOW
12
ADC AVERAGING FACTOR
132uA
205uA
350uA
640uA
N/A
⎞
⎟ ⎟
⎠
(MAX_RES = 0)
Section
where:
k = Boltzmann’s constant
T = absolute temperature in Kelvin
q = electron charge
η
(DA_N = 0)
= diode ideality factor
2X
4.4. The available conversion rates are
BE
is then proportional to absolute
105uA
150uA
235uA
405uA
750uA
(DA_N = 1)
SMSC EMC1053
1X
Datasheet
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