Interfaces With Grayhill Most Standard Quadrature Optical Encoders. Po

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Interfaces With Grayhill Most Standard Quadrature Optical Encoders. Po

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Optical Encoder Interface with Power Management Series GH65C11-X
Interfaces With Grayhill Most Standard Quadrature Optical Encoders. Power Management Feature Manages Encoder Power Consumption Battery Powered Systems (Typically Saves 90%). User Selectable Output Modes Simplify Interface: Standard Up/Down Magnitude/Direction Debounces Pushbutton.
Pinout
Options GH65C11-X-YY
Temperature: Commercial Industrial (-40° Packaging: lead wide Plastic lead wide gull wing SOIC lead SSOP GH65C11-C-SS GH65C11-N-PD GH65C11-N-SO
Available Combinations:
GH65C11-C-PD GH65C11-C-SO
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
Operation
GH65C11-X designed receive input from standard quadrature optical encoder. outputs from encoder connect pins respectively. power management feature used connecting encoder power supply outputs. When connected this manner, power applied encoder only during sampling periods, thus conserving power battery powered systems. Sample rate nominal second allowing high speed quadrature input. GH65C11-X operates user selectable output modes. mode selection pins, sampled power mode selected according truth table. modes outlined below: Mode This mode delivers standard quadrature output pins These outputs follow state inputs. Mode DOWN This mode monitors incoming quadrature pulses output when count detected pulses output when down count detected decoding). pulses positive going 20uS nominal duration. Mode MAGNITUDE, DIRECTION This mode pulses when valid change detected incoming quadrature inputs decoding). Direction determined output which will high positive quadrature directions (phase leads phase negative. encoder contains integral switch, debounced connecting switch input other desired active state. Debounce satisfied 16.4 nominal stable input condition. Because inputs floating, pull-up pull-down) resistors required inputs.
Descriptions
Name Type Description M0,M1 Mode selection input pins. +5VDC nominal power source. RES* Reset pin, normally connected VDD. GND, nominal power return. Phase quadrature input pins. Switch input pin. Debounced switch output pin. connect, This must left unconnected. Power source encoder power management. oscillator pin. Phase down, direction, mode conditional output pin. BO/DN/DR Phase magnitude, mode conditional output pin. AO/UP/MG Types: Input, Output, Power. indicates signal active
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
Mode Select Pins
mode select pins select output mode GH65C11-X power-up according following truth table:
Mode Standard Quadrature Down Magnitude, Direction Test Mode, Standard Quadrature, Power Management Disabled
Reset
RES* active reset that usually connected directly most power supplies. built reset function holds device reset about 18mS after voltage this reaches logic high. slow rising power supplies sensitive applications hold this externally until power stabilized.
Input Pins
These pins receive incoming quadrature from encoder. Because inputs floating, open collector type encoders will require pull-ups these pins order create logic high. These pins sampled nominal rate about (depends timing accuracy), providing best case maximum input speeds various resolution encoders according following table:
Number quadrature Maximum allowable state changes speed encoder (rev. revolution sec.) 61.0 30.5 15.3 7.63 Note: table assumes exact duty quadrature recommended oscillation frequency. Pulses channel revolution
SWI, Pins
pins provide debounce switch input. input accepts active active high input signals provides debounced output pin. Debounce satisfied when input stable over nominal time period 16.4mS. Note that timing affects total time debounce. debounce feature used, should connected VDD.
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
Typical Circuits Debounce
Active
Active High
Debounced Output
Debounced Output
Power Management
These pins source power optical encoder only during sampling periods conserve power. recommended that these pins tied together. Maximum total current that sourced from these pins 40mA. Current sunk pins when power state. Power applied these pins roughly before after sampling 256uS intervals. This results approximately duty cycle. This timing compatible with Grayhill optical encoders compatible with others. Check with manufacturer encoder ensure compatibility. important sufficiently bypass this device when used with power management large transient current drawn typical optical encoder when switched off. 10uF tantalum electrolytic capacitor recommended when power supply located away from device. typical .1uF ceramic bypass capacitor should always used. conserve maximum power, pull-up resistors inputs should also connected pins. Total average current consumption when connected this manner estimated from formula: ITave (IEN IPU)
where: ITave total average current consumption. current used GH65C11. steady state current used encoder. current used pull-ups.
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
Oscillator
oscillator provides cost device timing. recommended circuit values shown below. Locate these parts close possible pin. Timing parameters listed this data sheet recommended part values which result operating frequency 30%. timing variations part variations, environmental conditions, supply voltages. Recommended Circuit
5.1K 47pF
AO/UP/MG, BO/DN/DR Output Pins
These pins output data from chip according condition mode select pins power mode standard quadrature outputs generated which follow inputs. This mode used retrofit designs which require quadrature inputs would improve with power management feature. order interface quadrature code directly microcontroller decoding resolution unit every quadrature state change); polling routine usually necessary. Consecutive samples then compared determine count should incremented decremented. decoding resolution unit every quadrature cycle) this task becomes simpler because every state change either phases other used determine direction. example, connected edge triggered interrupt generate change while output monitored service routine through determine direction. Mode DOWN; pulses output when count detected down output when down count detected (positive going, 20uS nominal duration). This allows simpler interface method encoders requiring decoding. hardware interrupts available, outputs this mode connected directly these interrupts. service routine increments count while other decrements count. This results very fast service routines with very system software requirements. Mode MAGNITUDE, DIRECTION; pulses output when change detected incoming quadrature. output indicates direction. This mode used when decoding required only interrupt available. Connect output this interrupt read direction through port connected output pin. This method results efficient system software, time, hardware resources.
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
Typical Circuit
Microcontroller Interface GH16C11
61C22-01-04-02
5.1K* 5.1K* 5.1K
BO/DN/DR AO/UP/MG 47pF 5.1K .1uF
Direction Magnitude
10uF*
Switch (active low) Required
polled I/O)
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
Maximum Ratings
Rating Storage Temperature Temperature Under Bias Voltage Input Current Sourced Output Current Sunk Output Total Output Current Absolute Maximum +150 +125 -0.6V 0.6V
Operating Characteristics
Characteristic Supply Voltage Supply Current Output Voltage Output High Voltage Input Voltage Input High Voltage Input Bias Current Industrial Operating Temperature Commercial Operating Temperature Symbol Min. Typ. Max. 6.25 Units Conditions
8.7mA 4.5V -5.4mA 4.5V
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
Timing Diagrams
Input Change
Mode Output
Mode Output
Mode
Mode
Input Sampled
Parameter Min.* Typ. *Assumes timing accuracy oscillator circuit
Max.*
Units
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
Packaging Information
lead wide Plastic
Seating Plane
Symbol
Min. mm/in 6.096/0.240 7.620/0.300 22.479/0.885
Typ. mm/in 7.620/0.300
Max. mm/in 7.112/0.280 8.255/0.325 23.495/0.925
20.320/0.800 2.489/.098 0.889/0.035 0.355/0.014 1.524/0.060 3.048/0.120 3.048/0.120 4.064/0.160 3.810/0.150 3.556/0.140 2.591/0.102 0.559/0.022
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
lead wide gull wing SOIC
Seating Plane
Symbol
Min. mm/in 7.417/0.292 10.008/0.394 11.354/0.447 0.356/0.014 2.362/0.093 0.406/0.016 0.241/0.0095 0.381/0.015
Typ. mm/in
Max. mm/in 7.595/0.299 10.643/0.419 11.735/0.462 0.483/0.019 2.642/0.104 1.143/0.045 0.318/0.0125 0.762/0.030
1.270/.050
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896
OPTICAL ENCODER INTERFACE: Series GH65C11-X
lead SSOP
Seating Plane
Symbol
Min. mm/in 5.200/0.205 7.650/0.301 7.070/0.278 0.250/0.010 1.730/0.068 0.550/0.022 0.130/0.005
Typ. mm/in
Max. mm/in 5.380/0.212 7.900/0.311 7.330/0.289 0.380/0.015 1.990/0.078 0.950/0.037 0.220/0.009
0.650/0.026
Grayhill, Inc. Hillgrove Avenue LaGrange, 60525 Phone: (708) 354-1040 Fax: (708) 354-2820 http://www.grayhill.com Bulletin #719 Original 0896

Interfaces With Grayhill Most Standard Quadrature Optical Encoders. Po

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