Datasheet

ADT7316/ADT7317/ADT7318
Rev. B | Page 11 of 44
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
OUT
-A
V
REF
-AB
CS
D+
V
DD
GND
V
OUT
-B
V
OUT
-D
V
REF
-CD
SCL/SCLK
INT/INT
D– LDAC
DOUT/ADD
SDA/DIN
V
OUT
-C
TOP VIEW
(Not to Scale)
ADT7316/
ADT7317/
ADT7318
02661-006
Figure 9. Pin Configuration QSOP
Table 5. Pin Function Descriptions
Pin No. Mnemonic Description
1 V
OUT
-B Buffered Analog Output Voltage from DAC B. The output amplifier has rail-to-rail operation.
2 V
OUT
-A Buffered Analog Output Voltage from DAC A. The output amplifier has rail-to-rail operation.
3 V
REF
-AB
Reference Input Pin for DAC A and DAC B. It may be configured as a buffered or unbuffered input to both DAC A
and D
AC B. It has an input range from 0.25 V to V
DD
in unbuffered mode and from 1 V to V
DD
in buffered mode.
DAC A and DAC B default on power-up to this pin.
4
CS
SPI Active Low Control Input. This is the frame synchronization signal for the input data. When CS goes low, it
enables the input register, and data is transferred in on the rising edges and out on the falling edges of the
subsequent serial clocks. It is recommended that this pin be tied high to V
DD
when operating the serial interface
in I
2
C mode.
5 GND Ground Reference Point for All Circuitry on the Part. Analog and digital ground.
6 V
DD
Positive Supply Voltage, 2.7 V to 5.5 V. The supply should be decoupled to ground.
7 D+ Positive connection to external temperature sensor.
8 D− Negative connection to external temperature sensor.
9
LDAC
Active low control input that transfers the contents of the input registers to their respective DAC registers. A falling
edge on this pin forces any or all DAC registers to be updated if the input registers have new data. A minimum
pulse width of 20 ns must be applied to the LDAC pin to ensure proper loading of a DAC register. This allows
simultaneous update of all DAC outputs. Bit C3 of the Control Configuration 3 register enables the LDAC
pin.
Default is with the LDAC
pin controlling the loading of DAC registers.
10
INT/INT
Over-Limit Interrupt. The output polarity of this pin can be set to give an active low or active high interrupt when
temperature or V
DD
limits are exceeded. Default is active low. Open-drain output—needs a pull-up resistor.
11 DOUT/ADD
DOUT: SPI Serial Data Output. L
ogic output. Data is clocked out of any register at this pin. Data is clocked out on
the falling edge of SCLK. Open-drain output—needs a pull-up resistor.
ADD: I
2
C Serial Bus Address Selection Pin. Logic input. A low on this pin gives the address 1001 000, leaving it
floating gives the address 1001 010, and setting it high gives the address 1001 011. The I
2
C address set up by the
ADD pin is not latched by the device until after this address has been sent twice. On the eighth SCL cycle of the
second valid communication, the serial bus address is latched in. Any subsequent changes on this pin have no
affect on the I
2
C serial bus address.
12 SDA/DIN
SDA: I
2
C Serial Data Input. I
2
C serial data that is loaded into the device registers is provided on this input. Open-
drain configuration—needs a pull-up resistor.
DIN: SPI Serial Data Input. Serial da
ta to be loaded into the device registers is provided on this input. Data is
clocked into a register on the rising edge of SCLK. Open-drain configuration—needs a pull-up resistor.
13 SCL/SCLK
Serial Clock Input. This is the clock input f
or the serial port. The serial clock is used to clock data out of any register
of the ADT7316/ADT7317/ADT7318 and also to clock data into any register that can be written to. Open-drain
configuration; needs a pull-up resistor.
14 V
REF
-CD
Reference Input Pin for DAC C and DAC D. It can be configured as a buffered or unbuffered input to both DAC C
and D
AC D. It has an input range from 0.25 V to V
DD
in unbuffered mode and from 1 V to V
DD
in buffered mode.
DAC C and DAC D default, on power-up, to this pin.
15 V
OUT
-D Buffered Analog Output Voltage from DAC D. The output amplifier has rail-to-rail operation.
16 V
OUT
-C Buffered Analog Output Voltage from DAC C. The output amplifier has rail-to-rail operation.