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Atmel Electronic Components Datasheet

e1217X Datasheet

32-kHz Standard Watch CMOS ic

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e1217X pdf
32-kHz Standard Watch CMOS IC
e1217X
Features
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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
2
e1217X
7
36
45
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
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
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 electrostatic discharges. However, precautions to mini-
which, if exceeded, may permanently change or damage mize the build-up of electrostatic charges during handling
the device.
are recommended.
All inputs and outputs on Atmel Wireless & The circuit is protected against supply-voltage reversal
Microcontrollers’ circuits are protected against for typically 5 minutes.
Rev. A2, 12-Dec-00
1 (5)


Atmel Electronic Components Datasheet

e1217X Datasheet

32-kHz Standard Watch CMOS ic

No Preview Available !

e1217X pdf
e1217X
Functional Description
Voltage Regulator
An integrated voltage regulator provides the oscillator
www.dawtaitshheaet4wu.eclolmcontrolled negative supply voltage VREG.
This improves the stability of the oscillator and keeps cur-
rent consumption at a minimum.
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 oscilla-
tor 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.
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 and the p-channel de-
vice of the other buffer are activated. The p-channel
devices of both buffers are active (figure 3) between two
the pulses.
Cycle time and pulse width can be chosen via a metal-
mask option (table1).
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 ap-
plied 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.
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 re-
quired for testing the mechanical parts of the watch.
Table 1 Motor options
Cycle time TM
Motor pulse width tM
Motor test cycle time TMT
= 2, 4, 6, 8, 10, 12, 20, 24, 30, 40, 60, 80, 120 s
= 0.98 to 14.65 ms in increments of 0.98 ms
= 250, 125, 62.5 ms
2 (5) Rev. A2, 12-Dec-00


Part Number e1217X
Description 32-kHz Standard Watch CMOS ic
Maker ATMEL Corporation
Total Page 5 Pages
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