Page 1
pF
−
××
CF5705 series
NIPPON PRECISION CIRCUITS INC.
Analog Watch Stepping Motor Driver
OVERVIEW
The CF5705 series is a low-current analog watch stepping motor driver CMOS IC with built-in 32.768 kHz
crystal oscillator circuit.
FEATURES
■
32.768 kHz crystal oscillator circuit
C
and C
G
■
3.6 to − 1.2 V operating supply voltage range
built-in
D
■
Operating current consumption
•V
= –1.55V, C
SS
•V
= –2.8V, C
SS
Note: Current consumption depends on the built-in capacitor.
■
Reset function
= 16pF: 250 nA (max)
D
= 26pF: 1000 nA (max)
D
4 Hz and subsequent frequency dividers are reset
SERIES LINEUP
Pad coordinates Motor
Version
12345678
CF5705AA XT XTN RESET VSS TEST OUT2 OUT1 VDD 1 4.9m 125m 4 16
CF5705BC VSS RESET XT XTN VDD OUT2 OUT1 TEST 250m 23.4m 125m 4 26
CF5705AD XT X TN RESET VSS TEST OUT2 OUT1 VDD 1 23.4m 125m 4 30
CF5705AE XT XTN RESET VSS TEST OUT2 OUT1 V DD 20 5.9m 125m 4 16
CF5705CF VSS TEST XTN XT V DD OUT2 OUT1 RESET 1 4.9m 62.5m 4 16
CF5705CG VSS TEST XTN XT VD D OUT2 OUT1 RESET 1 3.9m 62.5m 4 16
1. Parasitic capacitance is included. Parasitic capacitance: C
G
= C
= 4pF
D
Cycle
(Tcy/2)
sec
Pulse
(Tpw)
sec
Test
(Tcy)
sec
Built-in
capacitor
C
G
pF
1
C
D
PART NUMBER GUIDE
CF5705
ORDERING INFORMATION
De vice Pack ag e
CF5705
Chip form
Function(Motor, Built-in capacitor)
Pad coordinate
NIPPON PRECISION CIRCUITS—1
Page 2
×
µ
µ m)
CF5705 series
PAD DIMENSIONS
NPC
HA5705
1
2
3
4
(0,0)
Chip size: 1.000
Chip thickness: 220 µ m
Pad size: 100 × 100 µ m
Re verse side: V
BLOCK DIAGRAM
(Top view)
(1000,1060)
8
7
6
5
1.060 mm
level
DD
PAD COORDINATES
Number X (
1 155 785
2 155 597
3 155 363
4 155 175
5 844 175
6 844 363
7 844 694
8 844 882
TESTRESET
m) Y (
XT
XTN
PAD DESCRIPTION
Name Description
VS S Negative supply voltage
V DD Positive supply voltage
X T Crystal oscillator circuit input
X TN Cr ystal oscillator circuit output
OUT1 Stepping motor driver output 1
OUT2 Stepping motor driver output 2
RESET Reset input
TEST Test mode select. 512 Hz clock output
32kHz
Oscillator
Voltage
regulator
OUT1
Divider and
Output buffer control
OUT2
Pin number: Refer to Series lineup.
NIPPON PRECISION CIRCUITS—2
Page 3
−
−
−
° C
−
−
−
° C
−
CF5705 series
SPECIFICATIONS
Absolute Maximum Ratings
V
= 0 V
DD
Parameter Symbol Rating Unit
Supply voltage range V
Input voltage range V
Storage temperature range T
Recommended Operating Conditions
Parameter Symbol Rating Unit
Supply voltage V
Operating temperature T
−
−
−
−
−
∆
ε
ε
SS
IN
stg
SS
opg
5.0 to 0.3 V
V
0.3 to 0.3 V
SS
40 to 125
3.6 to
1.2 V
20 to 75
Electrical Characteristics
V
= 0 V, T
DD
Operating supply voltage V
Operating current consumption
Reset input current I
Reset input resistance R
Motor output current I
Motor output cycle time
Motor output cycle time
Motor output pulsewidth
Oscillator start voltage
Oscillator start time T
Frequency voltage deviation
Frequency deviation
Internal capacitance
1. Current consumption is measured in the measurement circuit (see next page).
2. Ref er to Series lineup.
3. ε ’ = [f (1.55V) – f’
’ = [f (2.8V) – f’
f’
: Oscillation frequency center value of Standard Deviation in the same measuring conditions
0
= 25 ° C, X’tal C
a
= 55k Ω max
I
Parameter Symbol Condition
SS
2
(normal mode)
2
(test mode) t
2
2
3
2
] / f’
(C
= 16pF)
0
0
D
] / f’
(C
= 26pF)
0
0
D
No load, V
(C
1
I
DD
TR
No load, V
(C
TR
RESET: V
1.55V
RST
RESET: V
V
RST
V
RST
R
L
R
L
From supply ON to 512 Hz output
on TEST
f/f V
SS
MOT
T
T
V
RST
CY
CY
PW
STA
STA
Built-in C
’
Built-in C
C
, C
(C
G
D
G
= –1.55V,
SS
+ C
) = 15 pF, C
G
+ C
G
=
1.35 V, V
=
2.6 V, V
= 2 k Ω , V
= 1 k Ω , V
SS
) = 24 pF, C
RST
RST
D
= –2.8V,
D
= V
, V
DD
= V
, V
DD
= –1.55V 15 35 60 k Ω
SS
= –2.8V 5 15 5 0 k Ω
SS
=
1.55 V 0.7 – – m A
SS
=
2.4 V 2.18 2.29 – m A
SS
= − 1.2 → − 3.6 V, C
D
and C
D
G
+ C
) < 62 pF Refer to the SERIES LINEUP pF
D
= 16 pF
= 26 pF
= –
SS
= –2.8V – 25 10 0 nA
SS
= 5 pF – 0.2 1 ppm/0.1V
TR
Rating
Unit
min typ max
2.0
−−
1.2 V
– 0.15 0.25 µA
– 0.40 1.00 µA
–6–nA
s
Refer to the SERIES LINEUP
ms
ms
1.3 – – V
–25s
– 8 – 8 ppm
– 16 – 16 ppm
NIPPON PRECISION CIRCUITS—3
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Measurement Circuit
CF5705 series
VDD
TR
C
XT
RESET
TEST
A
IRST
XTN
X'tal
OUT1
Cr ystal: f = 32.768 kHz, CI = 20 k
CD
A
IMOT RL
Ω , C0 = 1.3pF, C1 = 2.6fF
VSS
OUT2
NIPPON PRECISION CIRCUITS—4
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FUNCTIONAL DESCRIPTION
Motor Output Waveform
T
PW
OUT1
OUT2
TCY/2
CF5705 series
T
PW
TCY/2
V
DD
V
SS
V
DD
V
SS
The motor output waveform cycle time and output pulsewidth are set by mask option.
Reset Function
T < T
ON
RESET
(open)
T
PW
OUT1
OUT2
TCY/2 TCY/2
Reset operation
A reset operation occurs when RESET is held HIGH
(V
) for a period of 93.75 ms or greater, otherwise
DD
T > T
ON
T
D
the reset is ignored. When the reset pulse is valid, the
4 Hz and subsequent frequency dividers are reset.
V
DD
V
SS
V
DD
V
SS
V
DD
V
SS
Reset Release
When the reset is released, the first output pulse
occurs on the output pin opposite the output pin
where the preceding motor drive output pulse
occurred; first pulse occurs on OUT1 if previous
motor drive pulse occurred on OUT2, and vice versa.
A delay of T
/2 − 0.125 to T
CY
/2 takes place from
CY
when reset is released until the first output pulse
occurs.
NIPPON PRECISION CIRCUITS—5
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Test Function
TEST
OUT1
OUT2
T < T
TCY/2
T
PW
)
)
CF5705 series
ch
TCY/2
T
PW
T > T
ch
V
DD
V
SS
t
CY
/2
t
CY
/2
V
DD
V
SS
V
DD
V
T
PW
SS
Normal mode (TEST = open circuit)
In test mode, a 512 Hz rectangular wave is output on
TEST. Note that the output load (probe) must be
greater than 10 M Ω and less than 20 pF. The motor
Test mode 1 (TEST = V
DD
T est mode 1 is invoked when TEST is held HIGH for
a minimum of 2 cycles of the 512 Hz clock
(T
> 3.9 ms), otherwise it is ignored. In test mode
CH
Test mode 2 (TEST = V
SS
T est mode 2 is a dedicated IC test mode. In test mode
2, the device operates at 32-times speed, with the
supply voltage connected directly to the oscillator
circuit. Note that if a reset input occurs, the internal
drive outputs on OUT1 and OUT2 continue to operate normally.
1, high-speed motor output operation occurs, with
the cycle time set by mask option to 62.5 or 125 ms.
operation is reset and device output stops. Once
operation stops, normal operation is not restored
until TEST is either open circuit or goes LOW.
NIPPON PRECISION CIRCUITS—6
Page 7
CF5705 series
NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to
improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility fo r
the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits
are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision
Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification.
The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or
malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter,
including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or
indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies.
NIPPON PRECISION CIRCUITS INC.
4-3, Fukuzumi 2-chome
Koto-ku, Tok yo 135-8430, Japan
NIPPON PRECISION CIRCUITS INC.
Telephone: 03-3642-6661
Facsimile: 03-3642-6698
NC9815AE 2000.07
NIPPON PRECISION CIRCUITS—7
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