E1217X-VF-DIT_技术文档

Features

• 32-kHz Oscillator

• 1.3 V to 1.8 V Operating-voltage Range

• 180 nA Typical Current Consumption

• Voltage Regulator

• Integrated Capacitors, Mask Selectable

• Mask Options for Pad Designation, Motor Period and Motor Pulse Width

• Low Resistance Outputs for Bipolar Stepping Motor

• Motor Fast-test Function

32-kHz

Standard Watch

CMOS IC

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. Integrated capacitors are provided (select-

able mask option) for tuning of the crystal. Low current consumption and high

oscillator stability are enabled by an on-chip voltage regulator.

e1217X

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1

Pad Configuration

Figure 1. Pinning

8

7

1

2

e1217X

3

6

5

4

Chip size 1.06 mm P 1.02 mm

Pad size: 112 µm P 112 µm

Pad window: 100 µm P 100 µm

Pin Description

Symbol

Function

1, 4

V_SS

Negative supply voltage

Positive supply voltage

Oscillator input/output

Motor drive outputs

Reset input

5, 6, 8

V_DD

1 to 4

OSCIN/OSCOUT

MOT 1/2

RESET

(7/5) or (7/6)

1 to 5, 8

TEST

Test input/output

2

e1217X

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e1217X

Functional Description

Voltage Regulator

An integrated voltage regulator provides the oscillator with a well-controlled negative

supply voltage V_REG. This improves the stability of the oscillator and keeps current con-

sumption at a minimum.

Oscillator

The oscillator inverter with feedback resistor generates 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

Motor Drive Output

A 21-bit binary counter is provided, dividing the oscillator frequency down to 1/64 Hz.

The leading six stages are connected to V_DDand V_REG, while the remaining 15 stages

are connected to V_DDand V_SS.

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 device of

the other buffer are activated. The p-channel devices of both buffers are active (see Fig-

ure 3) between the two pulses.

Cycle time and pulse width can be chosen via a metal mask option (Table 1).

RESET

A debounced RESET input is provided. Connecting the RESET input to V_DDresets the

12 low-order stages of the frequency divider, thus disabling further motor pulses. Motor

pulses, which are in progress when the reset function is applied, will be completed. After

releasing the RESET pad from V_DD, 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, V_DDmust be applied for at least 31.2 ms. Dur-

ing 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 O 10 Mꢀ, C O 20 pF). This signal can be used for testing and tuning

the oscillator. Connecting TEST to V_DDfor 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 mechani-

cal parts of the watch.

Table 1. Motor Options

Motor-cycle Parameters

Value

Cycle time T_M

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

Motor pulse width t_M

Motor test cycle time T_MT

3

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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

V_SS

Value

-0.3 to +5

Unit

V

Supply voltage

Input voltage range, all inputs

Output short-circuit duration

Power dissipation (DIL package)

Operating ambient temperature range

Storage temperature range

V_IN

(V_SS- 0.3 V) ? V_IN? (V_DD+ 0.3 V)

indefinite

V

P_tot

T_amb

T_stg

125

mW

LC

-20 to +70

-40 to +125

LC

Lead temperature during soldering at 2 mm

distance, 10 s

T_sld

260

LC

Operating Characteristics

V_DD= 0 V; V_SS= -1.55 V; T_amb= +25LC; C_TR= 15 pF, unless otherwise specified.

All voltage levels are measured with reference to V_DD. Test crystal as specified below.

Parameters

Test Conditions

Symbol

V_SS

Min.

Typ.⁽¹⁾

Max.

-1.8

Unit

V

Operating voltage

Operating current

RESET input current

Motor Outputs

Motor output current

Motor period

Functional test (Figure 2)

C_oscout= 16 pF, R_L= R

RESET = V_DD

-1.3

I_SS

-180

8

-300

nA

I_R

R_L= 2 kꢀ, V_SS= -1.55 V

I_M

T_M

T_MT

±0.7

mA

s

See Table 2

Motor pulse width

Motor test period

Oscillator

ms

Stability

ꢁV_SS= 100 mV, C_TR= 5 pF

ꢁf/f

V_ST

0.1

ppm

V

Start-up voltage

Integrated input capacitor

Integrated output capacitor

Startup within 2 s

-1.3

C_{OSC IN}

C_{OSC OUT}

See Table 2

pF

C_OSCOUTmax= 24 pF

Note:

1. Typical parameters represent the statistical mean values.

4

e1217X

4728A–CLOCK–06/03

e1217X

Figure 2. Functional Test Circuit

RESET

MOT1

V_SS

8

7

1

2

TEST

R_L

e1217X

C_TR

OSCIN

MOT2

V_DD

6

5

3

4

OSCOUT

Range of trimmer capacitance: C_TR= 5 pF to 30 pF

Test Crystal

Specification

Frequency

f = 32,768 Hz

R_S= 30 kꢀ

C₀= 1.5 pF

C₁= 3 fF

Series resistance

Static capacitance

Dynamic capacitance

Load capacitance

C_L= 8 pF

Additional Notes

1. It is recommended to connect the quartz case to V_DD(by conductive epoxy).

2. Capacitive coupling of TEST to OSCIN must be minimized by appropriate layout

of the PCB to avoid disturbancing the oscillator.

5

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Figure 3. Motor Drive Outputs in Normal Mode and Motor Test

T > t_TIN

T < t_TIN

TEST

T_M

T_MT

MOT1

t_M

MOT2

T_M/2

Figure 4. Motor Drive Outputs and RESET

T < t_RIN

T > t_RIN

(open)

RESET

t_M

MOT1

t_M

T_M/2

MOT2

T_M

6

e1217X

4728A–CLOCK–06/03

e1217X

Ordering Information

Table 2. Option List e1217X

Integrated

Motor

Capacitance⁽¹⁾

Cycle

(T_M)

s

Pulse

(t_M)

ms

Test

C_OSCINC_OSCOUT

(T_MT

)

Option

-B

ms

pF

2

pF

14

Pad 1

V_SS

Pad 2

TEST

Pad 3

OSCIN

OSCOUT

RESET

OSCOUT

OSCIN

Pad 4

OSCOUT

OSCIN

V_SS

Pad 5

V_DD

Pad 6

MOT2

VDD

Pad 7

Pad 8

RESET

V_DD

2

3.9

5.9

3.9

4.9

5.9

3.9

4.9

125

62.5

125

62.5

125

MOT1

-S

2

V_SS

TEST

V_DD

-T

10

2

V_SS

TEST

V_DD

-VA

-VB

-VC

-VF

-VH

4

V_SS

TEST

V_DD

2

4

OSCIN

V_SS

OSCOUT

TEST

MOT2

V_DD

40

2

V_SS

V_DD

4

V_SS

TEST

2

4

OSCIN

OSCOUT

MOT2

RESET

-WB

2

4

V_SS

TEST

V_DD

Note:

1. On-chip stray capacitance included

7

4728A–CLOCK–06/03

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Printed on recycled paper.

4728A–CLOCK–06/03

xM


型号：	E1217X-VF-DIT
厂家：	ATMEL
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E1217X-VF-DIT [ATMEL]

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