ADUC816 Analog Devices, ADUC816 Datasheet - Page 19

• Manufacturer Part Number: ADUC816
• Description: Precision Analog Microcontroller: 1MIPS 8052 MCU + 8kB Flash + Dual 16-Bit ADC + 12-Bit DAC
• Manufacturer: Analog Devices

Specifications of ADUC816

• Mcu Core: 8052
• Mcu Speed (mips): 1.3
• Sram (bytes): 256Bytes
• Gpio Pins: 34
• Adc # Channels: 4

Pin No.
52-Lead
MQFP
1, 2
3–4,
9–12
5
6
7
8
13
14
15
16–19,
22–25
REV. A
13
1
Pin No.
56-Lead
CSP
56, 1
2–3,
11–14
4, 5
6, 7, 8
9
10
15
16
17
18–21,
24–27
52
14
PIN 1
Mnemonic
P1.0/P1.1
P1.0/T2
P1.1/T2EX
P1.2–P1.7
P1.2/DAC/IEXC1
P1.3/AIN5/IEXC2
P1.4/AIN1
P1.5/AIN2
P1.6/AIN3
P1.7/AIN4/DAC
AV
AGND
REFIN(–)
REFIN(+)
SS
MISO
RESET
P3.0–P3.7
P3.0/RXD
P3.1/TXD
P3.2/ INT0
P3.3/ INT1
P3.4/T0
P3.5/T1
P3.6/ WR
P3.7/ RD
(Not to Scale)
56-Lead MQFP
ADuC816
DD
TOP VIEW
Type
I/O
I/O
I/O
I
I/O
I/O
I
I
I
I/O
S
S
I
I
I
I/O
I
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
40
26
1
PIN FUNCTION DESCRIPTIONS
PIN FUNCTION DESCRIPTIONS
39
27
Description
P1.0 and P1.1 can function as digital inputs or digital outputs and have a pull-up configuration as
described for Port 3. P1.0 and P1.1 have an increased current drive sink capability of 10 mA.
P1.0 and P1.1 also have various secondary functions as described below. P1.0 can be used to
provide a clock input to Timer 2. When enabled, Counter 2 is incremented in response to a
negative transition on the T2 input pin.
P1.1 can also be used to provide a control input to Timer 2.When enabled, a negative transition
on the T2EX input pin will cause a Timer 2 capture or reload event.
Port 1.2 to Port 1.7 have no digital output driver; they can function as a digital input
for which 0 must be written to the port bit. As a digital input, these pins must be driven high or
low externally. These pins also have the following analog functionality: The voltage output from
the DAC or one or both current sources (200 μA or 2 × 200 μA) can be configured to appear at
this pin.
Auxiliary ADC input or one or both current sources can be configured at this pin.
Primary ADC, Positive Analog Input
Primary ADC, Negative Analog Input
Auxiliary ADC Input or Muxed Primary ADC, Positive Analog Input
Auxiliary ADC Input or Muxed Primary ADC, Negative Analog Input. The voltage output from the
DAC can also be configured to appear at this pin.
Analog Supply Voltage, 3 V or 5 V
Analog Ground. Ground reference pin for the analog circuitry.
Reference Input, Negative Terminal
Reference Input, Positive Terminal
Slave Select Input for the SPI Interface. A weak pull-up is present on this pin.
Master Input/Slave Output for the SPI Interface. A weak pull-up is present on this input pin
Reset Input. A high level on this pin for 16 core clock cycles while the oscillator is running resets
the device. There is an internal weak pull-down and a Schmitt trigger input stage on this pin.
P3.0–P3.7 are bidirectional port pins with internal pull-up resistors. Port 3 pins that
have 1s written to them are pulled high by the internal pull-up resistors, and in that state can be
used as inputs. As inputs, Port 3 pins being pulled externally low will source current because of
the internal pull-up resistors.When driving a 0-to-1 output transition, a strong pull-up is active for
two core clock periods of the instruction cycle. Port 3 pins also have various secondary functions
including: Receiver Data for UART Serial Port
Transmitter Data for UART Serial Port
External Interrupt 0.This pin can also be used as a gate control input to Timer 0.
External Interrupt 1.This pin can also be used as a gate control input to Timer 1.
Timer/Counter 0 External Input.
Timer/Counter 1 External Input
External Data Memory Write Strobe. Latches the data byte from Port 0 into an external data
memory.
External Data Memory Read Strobe. Enables the data from an external data memory to Port 0.
–19–
14
NOTES
1. THE EXPOSED PADDLE MUST BE LEFT
1
UNCONNECTED.
PIN 1
INDICATOR
(Not to Scale)
56-Lead LFCSP
ADuC816
TOP VIEW
42
29
ADuC816