ADZS-U4050LF-EZKIT
User Guide
UG-1163
Rev. 0 | Page 9 of 31
On-Board Digital I
2
C Temperature Sensor
The ADZS-U4050LF-EZKIT board has an on-board I
2
C digital
temperature sensor,
ADT7420
. The
ADT7420
(U6) is rated for
operation over the −40°C to +150°C temperature range.
The
ADT7420
operates from 2.7 V to 5.5 V. Operating at 3.3 V,
the average supply current is typically 210 μA and the shutdown
current is typically 2.0 μA.
The
ADT7420
has two available pins for address selection with
four possible I
2
C addresses. The user can configure the address
by soldering resistors in R39 and R40 (to VCC), and R41 and
R42 (to GND). The default address is 0x48.
The
ADT7420
is connected to the I
2
C interface and can generate
an interrupt signal to interrupt the microcontroller. The interrupt
signal pin of the
ADT7420
is connected to Pin P1_14 of the
ADuCM4050
.
The temperature sensor can be disconnected from the board
supply by unshorting the JP5 header. Figure 7 shows the circuit
with the
ADT7420
chip in the middle and the JP5 header above
the chip.
16076-
007
Figure 7. I
2
C Temperature Circuit
