upd4701a

Manufacturer Part Numberupd4701a
DescriptionMos Integrated Circuit
ManufacturerRenesas Electronics Corporation.
upd4701a datasheet
 


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INCREMENTAL ENCODER COUNTER
DESCRIPTION
The PD4701A is a counter for an X, Y 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 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)
X axis: X
, X
2-phase signal
A
B
Y axis: Y
, Y
2-phase signal
A
B
• Counters: 12-bit binary up/down counters (2 sets, X & Y)
Reset value: 000H
• 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
X
, Y
: A-phase inputs
A
A
X
, Y
: B-phase inputs
B
B
RIGHT
LEFT
Key inputs
MIDDLE
CS
: Chip Select
X/Y
: X/Y Counter Select
U/L
: Upper/Lower Byte Select
D
: Data outputs
0 to 7
CF
: Count flag
RESET X Counter
SF
: Count flag
RESET Y
Document No. IC-3303 (1st edition)
(O. D. No. IC-6947A)
Date Published March 1997 P
Printed in Japan
DATA SHEET
MOS INTEGRATED CIRCUIT
4-multiplication count method used
2 (including key input flag)
PIN CONFIGURATION (Top View)
X
A
X
B
RESET X
Y
A
Y
B
RESET Y
RIGHT
LEFT
MIDDLE
reset inputs
SF
CF
V
SS
PD4701A
1
24
V
DD
2
23
D
7
3
22
D
6
4
21
D
5
5
20
D
4
6
19
D
3
7
18
D
2
8
17
D
1
9
16
D
0
10
15
CS
11
14
X/Y
12
13
U/L
©
1993

upd4701a 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

    PIN FUNCTIONS Pin Name Input/Output CPU CS Input interface block X/Y Input U/L Input RESET X Input RESET Y D Output (3-state) CF Output SF Output Mouse Input A B interface (Schmitt input) block ...

  • 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

    CONNECTION TO CPU SYSTEM An example of connection to a CPU system is shown in Fig. 4. Fig. 4 Example of Connection to CPU System Output Port and IORD MRD ...

  • 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

    No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in this document. ...