EM1537 Datasheet, PDF (3/7 Pages) EM Microelectronic - MARIN SA – Low Power 32 kHz Circuit for Analog Quartz Watches

R
EM1537
Absolute Maximum Ratings
Parameter
Symbol
Conditions
Voltage at V_DD to GND
V_p
- 0.3 to + 4.0 V
Voltage on other terminals
Vn-0.3 V to Vp+0.3 V
Operating temperature
Top
- 10 to + 60 °C
Storage Temperature Range T_stg
Quartz serial resistor
Rq
- 55 to + 150 °C
50 kΩ
Stresses above these listed maximum ratings may cause
permanent damages to the device. Exposure beyond
specified operating conditions may affect device reliability
or cause malfunction.
Handling Procedures
This device has built-in protection against high static
voltages or electric fields; however, anti-static precautions
must be taken as for any other CMOS component. Unless
otherwise specified, proper operation can only occur when
all terminal voltages are kept within the voltage range.
Unused inputs must always be tied to a defined logic
voltage level.
Operating Conditions
Parameter
Supply voltage
Operating Temperature
Symbol Min
V_DD 1.2
T_A - 10
Max Unit
3.6 V
+ 60 °C
Electrical Characteristics 1.55 Volt
Vp = 1.55 V; Vss = 0 V; Ta = 25 °C; fq = 32768 Hz; Quartz crystal Rs = 30 kΩ; Motor coil resistance Rm = 2 kΩ; Supply
source resistor Ri = 10 Ω; unless otherwise specified.
Parameter
Symbol
Conditions
Supply
Supply voltage range
Supply voltage drop during
Motorpulse
Mean dynamic current
Mean current consumption
Mean current consumption
in variation with Rq of quartz
Vp
dVp
Idyn
In
dIn/dRq
Without motor and quartz
32 kHz 900mVpp sinus wave,
forced on OSCIN/OSCOUT, TEST
open
With quartz, without motor,
MTEST open, Ctr = 12 pF
Oscillator
Transconductance
Starting voltage
Starting time
Stability df/f*dVp
Input capacitance
Output capacitance
Trimmer capacitance
Gm
Vst
Tst
Cin
Cout
Ctr
Vp = 1.2 V, Vpp = 300 mV sinus
Within 10 seconds
Between 1.4 V and 1.6 V
C = nominal value
C = nominal value
Motordrivers
Voltage across Motor
Short circuit impedance
Rise and Fall time
Vmot
Rsc
Vp = 1.55 V, Rm = 2 kΩ
Vp = 1.25 V, Rm = 2 kΩ
Ri = 300 Ω, Rm = 2 kΩ,
T = - 10 to + 60 °C
Between motor pulses 100 mV
applied between MOT1 and MOT2
From 90% Vp to 10% Vn
MTEST Input/Output
Debounce delay
Amplitude
Mean current
Ttst
Vtst
30 pF // 1 MΩ load
Itst
Pulled to Vpp, ftst = 512 Hz
RESET Input
Debounce delay
Ts
Input current after delay Ts
Is
Pulled to Vp
* average input current (modulated by a frequency of 64 Hz)
Copyright © 2006, EM Microelectronic-Marin SA
3
10/06 – rev.A
Min
Typ
Max Unit
1.2
1.55
1.8
V
0.7
V
90
150
nA
250
350
nA
2.6
nA/kΩ
2.5
15
0.75
1
2
1.5
5
C +/- (0.1C + 0.5)
C +/- (0.1C + 0.5)
3
30
umho
V
sec
ppm/V
pF
pF
pF
1.35
1.4
V
1.00
1.1
V
1.00
1.2
V
150
300
Ω
40
200
ns
31.25
1.55
70
62.5
ms
Vpp
250
nA
7.81
23.43 ms
10
50
nA
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