ADT7301ARTZ-500RL7 Analog Devices Inc, ADT7301ARTZ-500RL7 Datasheet - Page 11

• Manufacturer Part Number: ADT7301ARTZ-500RL7
• Description: IC SENSOR TEMP 13BIT DGT SOT23-6
• Manufacturer: Analog Devices Inc

Specifications of ADT7301ARTZ-500RL7

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 150°C
• Output Type: MICROWIRE™, QSPI™, SPI™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-6
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 0.5°C
• Supply Current: 1.6mA
• Supply Voltage Range: 2.7V To 5.25V
• Resolution (bits): 13bit
• Sensor Case Style: SOT-23
• No. Of Pins: 6
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-ADT7301EB - BOARD EVALUATION FOR ADT7301
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: Q2494841C

SERIAL INTERFACE
The serial interface on the ADT7301 consists of four wires:
CS , SCLK, DIN, and DOUT. The interface can be operated in
3-wire mode with DIN tied to ground, in which case the inter-
face has read-only capability, with data being read from the data
register via the DOUT line. It is advisable to always use CS to
create a communications window, as shown in
improves synchronization between the ADT7301 and the master
device. The DIN line is used to write the part into standby mode,
if required. The
than one device is connected to the serial clock and data lines.
The part operates in a slave mode and requires an externally
applied serial clock to the SCLK input to access data from the
data register. The serial interface on the ADT7301 allows the
part to be interfaced to systems that provide a serial clock
synchronized to the serial data, such as the 80C51, 87C51,
68HC11, 68HC05, and PIC16Cxx microcontrollers as well as
DSP processors.
A read operation from the ADT7301 accesses data from the
temperature value register, while a write operation to the part
writes data to the control register.
DOUT
SCLK
DIN
CS
CS line is used to select the device when more
t
1
1
LEADING ZEROS
2
t
2
t
3
Figure 14
3
t
5
POWER-
DB13
DOWN
Figure 14. Serial Interface Timing Diagram
t
6
t
4
4
; this
DB12
Rev. A | Page 11 of 16
Read Operation
Figure 14 shows the timing diagram for a serial read from the
ADT7301. The CS line enables the SCLK input. Thirteen bits of
data plus a sign bit are transferred during a read operation.
Read operations occur during streams of 16 clock pulses. The
first 2 bits out are leading zeros and the next 14 bits contain the
temperature data. If CS remains low and 16 more SCLK cycles
are applied, the ADT7301 loops around and outputs the two
leading zeros plus the 14 bits of data that are in the temp-
erature value register. When CS returns high, the DOUT line
goes into three-state. Data is clocked out onto the DOUT line
on the falling edge of SCLK.
Write Operation
Figure 14 also shows the timing diagram for a serial write to the
ADT7301. The write operation takes place at the same time as
the read operation. Only the third bit in the data stream provides
a user-controlled function. This third bit is the power-down bit,
which, when set to 1, puts the ADT7301 into shutdown mode.
In addition to the power-down bit, all bits in the input data
stream should be 0 to ensure correct operation of the ADT7301.
Data is loaded into the control register on the 16
edge; the data takes effect at this time. Therefore, if the part is
programmed to go into shutdown, it does so at this point. If CS
is brought high before this 16
is not loaded and the power-down status of the part does not
change. Data is clocked into the ADT7301 on the rising edge
of SCLK.
DB0
15
DB1
16
t
7
DB0
t
8
th
SCLK edge, the control register
th
rising SCLK
ADT7301