Maker : ATMEL Corporation
Part No. : e1217X

  Datasheet PDF : e1217X.pdf
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Product Information

e1217X 32-kHz Standard Watch CMOS IC www.datasheet4u.com Features D 32-kHz oscillator D 1.3 V to 1.8 V operating-voltage range D 180 nA typical current consumption D Voltage regulator D Integrated capacitors, mask selectable D Mask options for pad designation, motor period and motor pulse width D Low resistance outputs for bipolar stepping motor D Motor fast-test function Pad Configuration 1 8 General Description The e1217X is an integrated circuit in CMOS Silicon Gate Technology for analog watches. It consists of a 32-kHz oscillator, frequency dividers down to 1/64 Hz, output pulse formers and push-pull motor drivers. For tuning of the crystal, integrated capacitors are provided (selectable mask option). Low current consumption and high oscillator stability are enabled by an on-chip voltage regulator. Pin 1, 4 5, 6, 8 1 to 4 (7/5) or (7/6) 1 to 5, 8 1 to 5, 8 Symbol VSS VDD OSCIN/ OSCOUT MOT 1/2 RESET TEST Function Negative supply voltage Positive supply voltage Oscillator input/output Motor drive outputs Reset input Test input/output 2 7 e1217X 3 6 4 5 95 9979 Figure 1. Chip size 1.06 mm x 1.02 mm Pad size: 112 mm x 112 mm Pad window: 100 mm x 100 mm Absolute Maximum Ratings Parameters Supply voltage Input voltage range, all inputs Output short circuit duration Power dissipation (DIL package) Operating ambient temperature range Storage temperature range Lead temperature during soldering at 2 mm distance, 10 s Symbol VSS VIN Ptot Tamb Tstg Tsld Value –0.3 to +5 (VSS–0.3 V) ≤ VIN ≤ (VDD + 0.3 V) indefinite 125 –20 to +70 –40 to +125 260 Unit V V mW °C °C °C Absolute maximum ratings define parameter limits which, if exceeded, may permanently change or damage the device. All inputs and outputs on Atmel Wireless & Microcontrollers’ 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. Rev. A2, 12-Dec-00 1 (5) e1217X Functional Description Voltage Regulator An integrated voltage regulator provides the oscillator with a well controlled negative supply voltage VREG. www.datasheet4u.com This improves the stability of the oscillator and keeps current consumption at a minimum. RESET A debounced RESET input is provided. Connecting the RESET input to VDD resets the low order 12 stages of the frequency divider, thus disabling further motor pulses. Motor pulses in progress when the reset function is applied are completed. After releasing the RESET pad from VDD, the next motor pulse appears with a delay of one half motor cycle on the drive output opposed to the former (figure 4). Due to the debounce circuitry on the RESET input, VDD must be applied for at least 31.2 ms. During RESET the input current is limited to 8 nA typically. Oscillator An oscillator inverter with feedback resistor is provided for generation of the 32768 Hz clock frequency. A total capacitance of 24 pF is integrated.This can be selected for COSCOUT in 2 pF increments via a mask option. Frequency Divider A 21-bit binary counter is provided, dividing the oscillator frequency down to 1/64 Hz. The leading six stages are connected to VDD and VREG, while the remaining 15 stages are connected to VDD and VSS. Test A test frequency of 512 Hz is output to this pad which can be measured with a high resistance probe (R ≥ 10 MW, C ≤ 20 pF). This signal can be used for testing and tuning the oscillator. Connecting TEST to VDD for at least 4 ms changes the motor cycle time from the selected value to the test cycle time (mask options), while the motor pulse width remains unchanged (figure 3). This feature can be used to reduce the amount of time required for testing the mechanical parts of the watch. Motor Drive Output The e1217X contains two push-pull output buffers for driving bipolar stepping motors. During a motor pulse, the n-channel device of one buffer ...

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