HCTL1100 Datasheet, PDF (12/40 Pages) Agilent(Hewlett-Packard) – General Purpose Motion Control ICs

12
Pin Descriptions and Functions
Input/Output Pins
Symbol
AD0/DB0-
AD5/DB5
DB6, DB7
Pin Number
PDIP PLCC
2-7 3-8
8, 9 9, 10
Description
Address/Data Bus – Lower 6 bits of 8-bit I/O port which are
multiplexed between address and data.
Data bus – Upper 2 bits of 8-bit I/O port used for data only.
Input Signals
Symbol
CHA/CHB
Index
R/W
ALE
CS
OE
Limit
Stop
Reset
ExtClk
V_DD
GND
SYNC
NC
Pin Number
PDIP PLCC
31, 30 34, 33
33 36
37 41
38 42
39 43
40 44
14 15
15 16
36 40
34 37
11, 35 12, 38
10, 32 1, 11,
23, 35
1
2
– 17, 39
Description
Channel A, B – Input pins for position feedback from an incremental
shaft encoder. Two channels, A and B, 90 degrees out of phase are
required.
Index Pulse – Input from the reference or index pulse of an incre-
mental encoder. Used only in conjunction with the Commutator. Either
a low or high true signal can be used with the Index pin. See Timing
Diagrams and Encoder Interface section for more detail.
Read/Write – Determines direction of data exchange for the I/O port.
Address Latch Enable – Enables lower 6 bits of external data bus into
internal address latch.
Chip Select – Performs I/O operation dependent on status of R/W line.
For a Write, the external bus data is written into the internal
addressed location. For Read, data is read from an internal location
into an internal output latch.
Output Enable – Enables the data in the internal output latch onto the
external data bus to complete a Read operation.
Limit Switch – An internal flag which when externally set, triggers an
unconditional branch to the Initialization/Idle mode before the next
control sample is executed. Motor Command is set to zero. Status of
the Limit flag is monitored in the Status register.
Stop Flag – An internal flag that is externally set. When flag is set
during Integral Velocity Control mode, the Motor Command is
decelerated to a stop.
Reset – A hard reset of internal circuitry and a branch to Reset mode.
External Clock
Voltage Supply – Both V_DD pins must be connected to a 5.0 volt supply.
Circuit Ground
Used to synchronize multiple HCTL-1100 sample timers.
Not connected. These pins should be left floating.