UPD4701AC NEC, UPD4701AC Datasheet

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UPD4701AC

Manufacturer Part Number
UPD4701AC
Description
MOS INTEGRATED CIRCUIT
Manufacturer
NEC
Datasheet

Specifications of UPD4701AC

Dc
0224
Document No. IC-3303 (1st edition)
(O. D. No. IC-6947A)
Date Published March 1997 P
Printed in Japan
DESCRIPTION
for the X and Y axes, direction discrimination and computation is performed, and count data is output in 8-bit parallel
form. In addition, a 3-contact-point input buffer is incorporated, which is useful for applications which use a pointing
device such as a mouse or track-ball. The CPU checks the switch input flag or count flag and reads the 12-bit count
data in two operations, one for the lower byte and one for the upper byte. The key input flag is output together with
the count data in the upper byte.
FEATURES
• X, Y 2-axis incremental encoder counter
• Counter input (Schmitt-triggered input)
• Counters: 12-bit binary up/down counters (2 sets, X & Y)
• Count data output: 8-bit parallel latch output
• On-chip 3-contact-point key input buffer circuit
• CMOS
• Single +5 V power supply
PIN NAMES
The PD4701A is a counter for an X, Y 2-axis incremental encoder. When a two-phase encoder signal is input
X axis: X
Y axis: Y
Reset value: 000H
X
X
RIGHT
LEFT
MIDDLE
CS
X/Y
U/L
D
CF
SF
A
B
0 to 7
, Y
, Y
A
B
: A-phase inputs
: B-phase inputs
: Chip Select
: X/Y Counter Select
: Upper/Lower Byte Select
: Data outputs
: Count flag
: Count flag
A
A
, X
, Y
Key inputs
B
B
2-phase signal
2-phase signal
RESET X Counter
RESET Y
INCREMENTAL ENCODER COUNTER
4-multiplication count method used
reset inputs
DATA SHEET
2 (including key input flag)
RESET X
RESET Y
MIDDLE
PIN CONFIGURATION (Top View)
MOS INTEGRATED CIRCUIT
RIGHT
LEFT
V
CF
SF
X
X
Y
Y
SS
A
B
A
B
1
2
3
4
5
6
7
8
9
10
11
12
PD4701A
24
23
22
21
20
19
18
17
16
15
14
13
V
D
D
D
D
D
D
D
D
CS
X/Y
U/L
©
DD
7
6
5
4
3
2
1
0
1993

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UPD4701AC Summary of contents

Page 1

INCREMENTAL ENCODER COUNTER DESCRIPTION The PD4701A is a counter for 2-axis incremental encoder. When a two-phase encoder signal is input for the X and Y axes, direction discrimination and computation is performed, and count data is output ...

Page 2

ORDERING INFORMATION Part Number PD4701AC 24-pin plastic DIP (600 mil) PD4701AGT 24-pin plastic SOP (375 mil) BLOCK DIAGRAM Phase X A Determination and X Edge Detection B RESET X RESET Y Phase Y A Determination and Y Edge Detection B ...

Page 3

... Y counter 2-phase signal input pins Key switch input pins. Key switch input are read as the high-order 4 bits of the X counter and Y counter upper byte as the internal status. Upper Byte Key Input Status Count Data +5 V power supply connection pin Ground pin PD4701A ...

Page 4

DESCRIPTION OF OPERATIONS 1. COUNT OPERATION The PD4701A executes an up-count and down-count by means of A & B 2-phase signals in the 12-bit up-down counter. An up-count is performed when the A-phase signals (X performed when the B-phase signals ...

Page 5

SWITCH INPUT OPERATION The PD4701A can process contact points as switch inputs (active-“L” input). Switch input is read as part of the count data upper byte together with the switch flag status as an internal status ...

Page 6

... These are connected to a CPU output port or reset signal. RESET Y The above connections enable the CPU to read the X counter, Y counter and switch input status. The application circuits and their parameters are for reference only and are not intended for use in actual design-ins. ...

Page 7

An example of a PD4701A data read is shown in Fig. 5. Fig. 5 Example of PD4701A Data Read Count value latch X counter low byte read X counter high byte & switch status read Y counter low byte read ...

Page 8

APPLICATION AREAS Two-phase incremental signals are used for detection and measurement of a vector quantity (a quantity that has direction and magnitude), and are widely employed in measuring instruments such as micrometers and linear scales, control systems for digital ...

Page 9

ABSOLUTE MAXIMUM RATINGS (T a PARAMETER Supply voltage Input voltage Output voltage Operating temperature Storage temperature Permissible loss DC CHARACTERISTICS (T = – PARAMETER Input voltage high Input voltage low Output voltage low Output voltage ...

Page 10

AC CHARACTERISTICS (T = – PARAMETER Input cycle High-level pulse width A B Low-level pulse width Signal phase difference time R, L High-level pulse width M Low-level ...

Page 11

Fig. 6 Two-Phase Signal & Switch Signal Input Timing t PWABH SAB RIGHT LEFT MIDDLE Fig. 7 Count Flag Output Timing t PWRS RESET SCTEN ...

Page 12

CS t SACS X/Y U/L t DCSD Fig. 9 Switch Flag Signal Output Timing RIGHT LEFT MIDDLE SF 12 Fig. 8 Data Output Timing t DAD t t DSFL DSFH PD4701A t HCSA t FCSD ...

Page 13

RECOMMENDED SOLDERING CONDITIONS The following conditions (see table below) must be met when soldering this product. Please consult with our sales offices in case other soldering process is used case soldering is done under different conditions. TYPES OF ...

Page 14

PLASTIC DIP (600 mil NOTES 1) Each lead centerline is located within 0.25 mm (0.01 inch) of its true position (T.P.) at maximum material condition. 2) Item "K" ...

Page 15

PIN PLASTIC SOP (375 mil NOTE Each lead centerline is located within 0.12 mm (0.005 inch) of its true position (T.P.) at maximum material condition. 13 detail of lead end 12 L ...

Page 16

... Specific: Aircrafts, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems or medical equipment for life support, etc. The quality grade of NEC devices is "Standard" unless otherwise specified in NEC's Data Sheets or Data Books. If customers intend to use NEC devices for applications other than those specified for Standard quality grade, they should contact an NEC sales representative in advance ...

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