UPD4701AGT NEC [NEC], UPD4701AGT Datasheet - Page 8

• Manufacturer Part Number: UPD4701AGT
• Description: MOS INTEGRATED CIRCUIT
• Manufacturer: NEC [NEC]

7. APPLICATION AREAS
direction and magnitude), and are widely employed in measuring instruments such as micrometers and linear scales,
control systems for digital servo motors, X-Y tables, etc., head position control for printers, magnetic disks, etc., robot
arm position control, and so on.
incremental signal processing, up/down counters for counting these pulses, and a data latch to hold the read data,
in IC form, enabling an X, Y 2-axis incremental signal processing system to be implemented easily.
and centronics interface application areas.
8. OPERATING PRECAUTIONS
1)
2)
8
Two-phase incremental signals are used for detection and measurement of a vector quantity (a quantity that has
The
In addition, a 3 switch-input buffer is incorporated, enabling this device to be widely used in man-machine interface
As the PD4701A incorporates two sets of 12-bit counters, large transient currents flow during a count operation.
Adecoupling capacitor of around 0.1 F should therefore be inserted between V
If a pulse shorter than the signal phase difference time t
Y
etc., a filter should be attached to the A/B phase inputs.
B
) this will result in a miscount. Therefore, if pulses shorter than t
PD4701A incorporates the direction judgment circuit and count pulse generator required for 2-phase
A or B Phase
B or A Phase
(UP count
the result is equivalent to no change in the count value.
If PW t
SAB
PD4701A
DOWN count or DOWN count
(350 ns), the count value remains the same before and after pulse input.
V
V
DD
SS
Tantalum electrolytic, laminated ceramic, or similar capacitor
of around 0.1 F
(Should be mounted right next to the IC.)
+ 5 V
SAB
UP count is implemented, and therefore
(350 ns) is input to the A/B phase inputs (X
PW
SAB
are to be input because of encoder bounds,
DD
and V
SS
of the PD4701A.
A
PD4701A
, X
B
, Y
A
,