E1466D ATMEL | Alldatasheet
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Technical content
Features
32-kHz Crystal Oscillator 1.1 V to 2.2 V Operating-voltage Range Integrated Capacitors for Digital Trimming Suitable for up to 12.5 pF Quartz Output Pulse Formers Mask Options for Motor Period and Pulse Width Low Resistance Output for Bipolar Stepping Motor Motor Fast-test Function
Description
The e1466D is an integrated circuit in CMOS Silicon Gate Technology for analog clocks. It consists of a 32-kHz oscillator , frequency divider, output pulse formers and push-pull motor drivers. Integrated capacitors are mask-selectable to accomodate the external quartz crystal. Additional capa citance can be selected through pad bonding for trimming the oscillator frequency. 32-kHz Clock CMOS IC with Digital Trimming e1466D
Figure 1. Pinning
integrated trimming capacitors to OSCIN, providing 15 tuning steps. 3 shows the trimming curve characteristic. ues for the integrated capacitors COSCIN and COSCOUT. will be activated. Both N-channel transistors are on and conducting between output pulses. The outputs are protected against inductive voltage spikes with diodes to both supply pins. Table 1. Frequency Trimming Table
4731A–CLOCK–06/03 Test Functions For test purposes, the TEST pad is open. With a high resistance probe (R /g17910 M /g87, C /g17920 pF), a test frequency f TEST of 128 Hz can be measured at the TEST pad. Connecting TEST (for at least 32 ms) to V DD changes the motor period from the selected value to T MT (mask-selectable) while the pulse width remains unaffected. This feature can be used for test- ing the mechanical parts of the clock. Absolute Maximum Ratings Absolute maximum ratings define parameter limits which, if exceeded, may permanently change or damage the device. All inputs and outputs on Atmel’s circuits are protected against electrostatic discharges. However, precautions to minimize the build-up of electrostatic charges during handling are recommended. The circuit is protected against supply voltage reversal for typically 5 minutes. Parameters Symbol Value Unit Supply voltage V SS -0.3 to 5 V V Input voltage range, all inputs V IN (VSS - 0.3 V) /g163 VIN /g163 (VDD + 0.3 V) V Output short-circuit duration indefinite Power dissipation (DIL package) P tot 125 mW Operating ambient temperature range T amb -20 to +70 /g176C Storage temperature range T stg -40 to +125 /g176C Lead temperature during soldering at 2 mm distance, 10 s T sld 260 /g176C
- Values can be selected in 1 pF steps. A total capacitance (C OSCIN + COSCOUT) of 38 pF is available
Figure 2. Functional Test VSS = 0 V, VDD = 1.5 V, Tamb = +25°C, unless otherwise specified. All voltage levels are measured with reference to VSS. Test crystal as specified below.
4731A–CLOCK–06/03
Ordering Information
Note: 1. On-chip stray capacitance included Table 2. Option List e1466Dx
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