datasheetbank_Logo
Integrated circuits, Transistor, Semiconductors Search and Datasheet PDF Download Site

UPD784031A View Datasheet(PDF) - NEC => Renesas Technology

Part Name
Description
View to exact match
UPD784031A
NEC
NEC => Renesas Technology NEC
UPD784031A Datasheet PDF : 90 Pages
First Prev 31 32 33 34 35 36 37 38 39 40 Next Last
µPD784031
8.6 A/D Converter
An analog/digital (A/D) converter having 8 multiplexed analog inputs (ANI0-ANI7) is incorporated.
The successive approximation system is used for conversion. The result of conversion is held in the 8-bit A/D
conversion result register (ADCR). Thus, speedy high-precision conversion can be achieved. (The conversion time
is about 7.5 µs at fCLK = 16 MHz.)
A/D conversion can be started in any of the following modes:
• Hardware start : Conversion is started by means of trigger input (INTP5).
• Software start : Conversion is started by means of bit setting the A/D converter mode register (ADM).
After conversion has started, one of the following modes can be selected:
• Scan mode : Multiple analog inputs are selected sequentially to obtain conversion data from all pins.
• Select mode: A single analog input is selected at all times to enable conversion data to be obtained
continuously.
ADM is used to specify the above modes, as well as the termination of conversion.
When the result of conversion is transferred to ADCR, an interrupt request (INTAD) is generated. Using this feature,
the results of conversion can be continuously transferred to memory by the macro service.
Figure 8-7. Block Diagram of A/D Converter
ANI0
ANI1
ANI2
ANI3
ANI4
ANI5
ANI6
ANI7
INTP5
Sample-and-hold circuit
Voltage comparator
Edge
detector
Conversion
trigger
Trigger enable
A/ D converter mode
register (ADM)
Successive conver-
sion register (SAR)
Control
circuit
INTAD
8
A/ D conversion
result register (ADCR)
Series resistor string
R/2
AVREF1
R
R/2
AVSS
8
8
Internal bus
34
 

Share Link: 

datasheetbank.com [ Privacy Policy ] [ Request Datasheet ] [ Contact Us ]