NCT218 Datasheet, PDF (1/19 Pages) ON Semiconductor – Low Voltage, High Accuracy Temperature Monitor with I2C Interface

NCT218
Low Voltage, High
Accuracy Temperature
Monitor with I²C Interface
The NCT218 is a dual−channel digital thermometer and
undertemperature/overtemperature alarm, intended for use in thermal
management systems requiring low power and size. The NCT218
operates over a supply range of 1.4 V to 2.75 V making it possible to
use it in a wide range of applications including low power devices.
The NCT218 can measure the temperature of a remote thermal diode
accurate to ±1°C and the ambient temperature accurate to ±1.75°C.
The device operates over a wide temperature range of −40°C to
+125°C.
The NCT218 includes series resistance cancellation, where up to
500 W (typical) of resistance in series with the temperature monitoring
diode can be automatically cancelled from the temperature result,
allowing noise filtering. The NCT218 has a configurable ALERT
output and overtemperature shutdown THERM pin.
Communication with the NCT218 is accomplished via the I²C
interface which is compatible with industry standard protocols.
Through this interface the NCT218s internal registers may be
accessed. These registers allow the user to read the current
temperature from both the local (ambient) and remote channels,
change the configuration settings and adjust each channels limits.
An ALERT output signals when the on−chip or remote temperatures
are out of range. The THERM output is a comparator output that can
be used to shut down the system if it exceeds the programmed limit.
The ALERT output can be reconfigured as a second THERM output, if
required.
Features
• Small DFN Package
• On−Chip and Remote Temperature Sensor
• Low Voltage Operation: 1.4 V to 2.75 V
• Low Quiescent Current:
♦ 44 mA Normal Mode (max)
♦ 20 mA Shutdown (max)
• Power Saving Shutdown Mode
• Operating Temperature Range of −40°C to 125°C
• Series Resistance Cancellation up to 500 W
• Low D− bias for Operation with Low Voltage Processors
• 2−wire I²C Serial Interface
• Programmable Over/Undertemperature Limits
• These are Pb−Free Devices
Applications
• Smart Phones, Tablet PCs, Satellite Navigation, Smart Batteries
© Semiconductor Components Industries, LLC, 2013
1
December, 2013 − Rev. 2
http://onsemi.com
MARKING
DIAGRAMS
DFN8
MT SUFFIX
CASE 511BU
1
T2 MG
G
WLCSP8
CASE 567DH
NCT218
AYWW
M
= Date Code
AY
= Assembly year
WW = Work Week
G
= Pb−Free Device
(Note: Microdot may be in either location)
PIN ASSIGNMENTS
V_DD
D+
D−
THERM
1
8
2
7
3
6
4
5
DFN8
(Top View)
SCL
SDA
ALERT/THERM2
GND
SDA _C1
B1
A1 ^VDD
GND C2
A2 D+
ALERT/
THERM2 _{C3 B3 A3 D−}
WLCSP8
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information on page 16 of
this data sheet.
Publication Order Number:
NCT218/D