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H1137WW27 Datasheet(PDF) 4 Page - EM Microelectronic - MARIN SA |
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H1137WW27 Datasheet(HTML) 4 Page - EM Microelectronic - MARIN SA |
4 / 6 page R H1137 Copyright © 2004, EM Microelectronic-Marin SA 4 www.emmicroelectronic.com Block Diagram O s c illator In itia l D iv id e r Pu ls e W id th D iv ider Div id e r 1 H z P u ls e R e p e titio n Div id e r M o to r Log ic M a ste r R e se t Mo to r D riv e r Test Lo gic OS C IN OS C OU T TE S T M O T 1 MO T 2 RE SET Fig. 4 Pin Assignments Name Function VN VP OSCIN OSCOUT MOT1 MOT2 RESET TEST Negative supply voltage Positive supply voltage Oscillator input Oscillator output Motor drive output 1 Motor drive output 2 Reset input Test input / output Functional Description Oscillator The 32’768Hz clock frequency is generated by a crystal oscillator. Input and output capacitors are integrated in the chip. Their values are metal mask selectable. Motor drive output The H1137 contains two push-pull output buffers for driv- ing bipolar stepping motors (see Fig. 3). Between two pulses, the two p-channel devices are active for motor damping. Reset Pulling the RESET input to VP resets the frequency di- viders and disables the motor pulses. Motor pulses in progress when the RESET function is applied, will be completed. After releasing the RESET pad from VP, the next motor pulse appears with a delay of one half motor cycle on the drive output MOT1 if the last motor pulse appeared on MOT2 or vice-versa (see Fig. 3). Due to the debounce circuitry on the RESET input, VP must be ap- plied for at least 23.4 ms to be accepted as RESET. Test mode The TEST pad fulfils two functions: a) For normal operation, the TEST pad is left open. The circuit outputs a square wave signal of 512Hz which can be used for tuning the oscillator. b) If the TEST pad is connected to VP, the period for the motor pulses changes to either 2 x 31.25 ms or 2 x 62.5 ms (mask options), while the motor pulse width remains unchanged (fast motor test). Test Test Pad Function Description Connected to VP Open Fast motor test Normal operation Increase the frequency for the motor pulses to 16Hz (32Hz) Output of square wave signal (512Hz) Test configuration Operating range of Trimmer Capacitance: 3pF ≤ CTR ≤ 30 pF RL Reset CTR VN VP VP VP Test Fig. 5 |
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