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Электронный компонент: E1466DFO

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1
4731ACLOCK06/03
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 capacitance can be selected through pad bonding
for trimming the oscillator frequency.
32-kHz Clock
CMOS IC with
Digital
Trimming
e1466D
2
e1466D
4731ACLOCK06/03
Pad Configuration
Figure 1. Pinning
MOT1
MOT2
e1466D
MOT1
(2)
OSCOUT
(1)
VDD
(1)
VSS
TEST
(2)
OSCIN
C4 C3 C2 C1
(1)
The pads VDD and OSCOUT are interchangeable per mask option
(2)
The pads TEST and MOT1 are interchangeable per mask option
Pin Description
Name
Description
VDD
Positive supply voltage
VSS
Negative supply voltage
OSCIN
Oscillator input
OSCOUT
Oscillator output
MOT1/2
Motor drive outputs
C1, C2, C3, C4
Oscillator trimming inputs
TEST
TEST input/output
3
e1466D
4731ACLOCK06/03
Functional Descripion
Oscillator
An oscillator inverter with feedback resistor is provided to generate the 32768 Hz clock fre-
quency. Values for the fixed capacitors at OSCIN and OSCOUT are mask-selectable (see
note 3 of "Operating Characteristics"). Four capacitor pads, C1 to C4, enable the users to add
integrated trimming capacitors to OSCIN, providing 15 tuning steps.
Trimming
Capacitors
A frequency variation of typically 4 ppm for each tuning step is obtained by bonding the capac-
itor pads to OSCIN. As none of these pads are bonded, the IC is in an untrimmed state. Figure
3 shows the trimming curve characteristic.
Note:
For applications which utilize this integrated trimming feature, Atmel will determine optimum val-
ues for the integrated capacitors COSCIN and COSCOUT.
Capacitor pads C1 to C4: 0 = open, 1 = connected to OSCIN
Combination C1 + C4 is redundant and therefore eliminated from the list
Motor Drive
Output
The e1466D 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
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.
The motor output period and pulse width are mask-programmable, as listed below:
Available motor periods (T
M
): 125, 250, 500 ms and 2, 16 s
Available max. pulse widths (t
M
): 15, 6, 23.4, 31.25, 46.9 ms and 1 s
Available motor periods for motor test (T
MT
): 250, 500 ms and 1 s
Note:
The following constraints for combination of motor period and pulse widths have to be consid-
ered: T
M
> 4
t
M
, T
MT
> 4
t
M
or alternatively T
M
= 2
t
M
, T
MT
= 2
t
M
Table 1. Frequency Trimming Table
Capacitor Pads
Trimming Step
C4
C3
C2
C1
0
0
0
0
0
0
0
1
0
0
1
0
0
1
0
0
0
1
2
3
1
0
0
0
0
0
1
1
0
1
0
1
0
1
1
0
4
5
6
7
1
1
0
0
1
1
1
0
1
0
0
1
8
9
10
1
1
1
1
0
1
1
1
1
0
1
1
1
1
0
1
11
12
13
14
4
e1466D
4731ACLOCK06/03
Test Functions
For test purposes, the TEST pad is open. With a high resistance probe (R
10 M
W
,
C
20 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
(V
SS
- 0.3 V)
V
IN
(V
DD
+ 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
C
Storage temperature range
T
stg
-40 to +125
C
Lead temperature during soldering at 2 mm distance, 10 s
T
sld
260
C
5
e1466D
4731ACLOCK06/03
Notes:
1. Typical parameters represent the statistical mean values
2. See test circuit
3. Values can be selected in 1 pF steps. A total capacitance (C
OSCIN
+ C
OSCOUT
) of 38 pF is available
4. These values are valid for 10 pF quartz applications. For C
L
= 12.5 pF these values change to 4.5, 6, 7.5, 9 pF
Figure 2. Functional Test
Operating Characteristics
V
SS
= 0 V, V
DD
= 1.5 V, T
amb
= +25C, unless otherwise specified.
All voltage levels are measured with reference to V
SS
. Test crystal as specified below.
Parameters
Test Conditions
Symbol
Min.
Typ.
Max.
Unit
Operating voltage
V
DD
1.1
1.5
2.2
V
Operating temperature
T
amb
-20
+70
C
Operating current
R
1
=
(2)
I
DD
2
5
mA
Motor Drive Output
Motor output current
V
DD
= 1.2 V, R
1
= 200
W
I
M
4.3
mA
Motor period
T
M
See option list
Motor period during motor test
T
MT
See option list
Motor pulse width
t
M
See option list
Oscillator
Startup voltage
Within 2 s
V
START
1.2
2.2
V
Frequency stability
D
V
DD
= 100 mV, V
DD
= 1.1 to 2.2 V
D
f/f
1
ppm
Integrated input capacitance
(3)
C
OSCIN
See option list
Integrated output capacitance
C
OSCOUT
See option list
Integrated capacitance for bond option
(4)
C1
C2
C3
C4
3
4
5
6
pF
pF
pF
pF
TEST Input
Input current
TEST = V
DD
peak current
I
TINH
0.6
3
10
A
Input current
TEST = V
SS
peak current
I
TINL
-0.6
-3
-10
A
Input debounce delay
t
TIN
23.4
31.2
ms
MOT1
MOT2
e1466D
MOT1
OSCOUT
R
1
VDD
VSS
TEST
OSCIN
C4 C3 C2 C1