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EM MICROELECTRONIC - MARIN SA
EM1537
Low Power 32 kHz Circuit for Analog Quartz Watches
Description
The EM1537 is an integrated circuit in a low power CMOS technology for battery operated wristwatches with bipolar stepping motors. Time base is a 32 kHz crystal oscillator. It has a very low current consumption of typ. 100 nA in a wide voltage range of 1.2 to 3.6 Volt. The IC is available in two voltage ranges - 1.2 to 1.8 Volt and 1.8 to 3.6 V. Motor pulse width is programmable from 0.098 ms to 14.65 ms in steps of 0.98 ms by metal mask. Motor period is programmable from 2 x 1s to 2 x 60 s in steps of 1 s selectable by metal mask. Motor pulse chopping is programmable from 1/8 to 8/8 in steps of 1/8 with chopping frequencies of 1024 Hz or 2048 Hz selectable by metal mask. Motor period in Motor test mode is selectable 2 x 31.25 ms or 2 x 62.5 ms by metal mask Input and output capacitors are integrated on chip and also programmable by metal mask. With a fully debounced RESET pad the motor can be stopped. A multi-functional bidirectional pad MTEST acts as output for a 32 Hz or 512 Hz for frequency tuning - if open, or - if connected to Vp - accelerates the motor period by a factor of 16 or 32.
Features
Low power 32 kHz Quartz oscillator Operating voltage ranges 1.55V and 3 Volt. Very low current consumption typ. 100 nA at 1.5V. Motor pulse width motor period and motor pulse chopping is programmable in a wide range by metal mask and don't require additional bonds. Fully debounced RESET input for accurate time setting and power saving during shelf life. Integrated capacitors, mask selectable is steps of 1 pF up to 35 pF. Operation temperature range: -10C to +60C Available in chip form, SO8 package
Applications
Analog watches Driver for bipolar stepping motors
Functional Diagram
RESET Vn Vn RESET VP
VP
MOT1
CTR
H1537 OSCIN MOT2
Rm (Stepping Motor)
OSCOUT
VP
VP
Operating range of Trimmer Capacitance: 3pF CTR 30 pF
Copyright (c) 2006, EM Microelectronic-Marin SA 10/06 - rev.A
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EM1537
Current Versions
Version Supply voltage (V) 1.55 1.55 1.55 1.55 1.55 1.55 Period (s) 2x1 2x5 2 x 20 2x1 2x20 2 x 10 Pulse width (ms) 5.859 5.859 5.859 4.883 6.836 4.883 Motor output Chop. Chop. ratio freqy (Hz) 8/8 0 8/8 0 8/8 0 8/8 0 8/8 0 8/8 0 Fast mode (ms) 2 x 62.5 2 x 62.5 2 x 62.5 2 x 62.5 2 x 31.25 2 x 31.25 Integrated Capa Cin Cout (pF) 2 4 2 2 4 2 (pF) 14 14 14 14 14 25 Test Fast test (Hz) 512 512 512 512 512 512 Pad options Pad 2 Pad 8 MTEST MTEST MTEST MTEST MTEST RESET RESET RESET RESET RESET RESET MTEST
016 017 020 021 026 058
Metal options Parameter Supply voltage Motor pulse period Motor pulse width Chopping ratio Chopping frequency Fast mode period Cin Cout Fast test Pad 2 Pad 8 Max Resolution (1.2 to 1.8) or (1.8 - 3.6) 2x1 2 x 60 2x1 0.977 14.65 0.977 1/8 8/8 1/8 1024 or 2048 2 x 31.25 or 2 x 62.5 2 35 - Cout 1 2 35 - Cin 1 32 or 512 MTEST or RESET RESET or MTEST Min Unit V s ms 1 Hz ms pF pF Hz Description
Motor period in Test mode Internal capacitor on OSCIN Internal capacitor on OSCOUT Test frequency on MTEST
Block Diagram
V S S OSCIN OSCOUT RESET 3 4
OSCILLATOR 32768Hz DIVIDER CHAIN DIVIDER CHAIN 2 FAST MODE 32Hz OUTPUT
2
MTEST
8 6
MASTER RESET MOTOR CONTROL
MOT1 MOT2
7
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EM1537
Absolute Maximum Ratings
Parameter Symbol Conditions Voltage at VDD to GND Vp - 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 Tstg - 55 to + 150 C Quartz serial resistor Rq 50 k 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 VDD 1.2 TA - 10 Max 3.6 + 60 Unit V C
Electrical Characteristics 1.55 Volt
Vp = 1.55 V; Vss = 0 V; Ta = 25 C; fq = 32768 Hz; Quartz crystal Rs = 30 k; Motor coil resistance Rm = 2 k; Supply source resistor Ri = 10 ; unless otherwise specified. Parameter Supply Supply voltage range Supply voltage drop during Motorpulse Mean dynamic current Mean current consumption Mean current consumption in variation with Rq of quartz Oscillator Transconductance Starting voltage Starting time Stability df/f*dVp Input capacitance Output capacitance Trimmer capacitance Motordrivers Voltage across Motor Symbol 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 90 250 2.6 Conditions Min 1.2 Typ 1.55 Max 1.8 0.7 150 350 Unit V V nA nA nA/k
Gm Vst Tst Cin Cout Ctr Vmot
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
2.5
15 0.75 1 2 1.5 5 C +/- (0.1C + 0.5) C +/- (0.1C + 0.5) 3 30 1.4 1.1 1.2 300 40 200 62.5 70 250 23.43 50
umho V sec ppm/V pF pF pF V V V ns ms Vpp nA ms nA
Short circuit impedance Rise and Fall time MTEST Input/Output Debounce delay Amplitude Mean current
Rsc
Vp = 1.55 V, Rm = 2 k Vp = 1.25 V, Rm = 2 k Ri = 300 , Rm = 2 k, T = - 10 to + 60 C Between motor pulses 100 mV applied between MOT1 and MOT2 From 90% Vp to 10% Vn
1.35 1.00 1.00 150
Ttst Vtst Itst
30 pF // 1 M load Pulled to Vpp, ftst = 512 Hz
31.25 1.55
RESET Input Debounce delay Ts Input current after delay Ts Is Pulled to Vp * average input current (modulated by a frequency of 64 Hz)
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EM1537
Electrical Characteristics 3.0 Volt
Vp = 3.0 V; Vss = 0 V; Ta = 25 C; fq = 32768 Hz; Quartz crystal Rs = 30 k; Motor coil resistance Rm = 2 k; Supply source resistor Ri = 10 ; unless otherwise specified. Parameter Supply Supply voltage range Supply voltage drop during Motorpulse Mean dynamic current Mean current consumption Mean current consumption in variation with Rq of quartz Oscillator Transconductance Starting voltage Starting time Stability df/f*dVp Input capacitance Output capacitance Trimmer capacitance Motordrivers Voltage across Motor Symbol 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 120 200 2.6 Conditions Min 1.8 Typ 3.0 Max 3.6 0.7 250 350 Unit V V nA nA nA/k
Gm Vst Tst Cin Cout Ctr Vmot
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
2.5 1.8
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1 2 1.5 5 C +/- (0.1C + 0.5) C +/- (0.1C + 0.5) 3 30 2.69 1.97 2.35 2.21 1.62 1.64 2.84 2.08 2.40 2.56 1.87 1.80 215 40 31.25 2.6 70 7.81 10 200 62.5 250 23.43 50
umho V sec ppm/V pF pF pF V V V V V ns ms Vpp nA ms nA
Short circuit impedance Rise and Fall time MTEST Input/Output Debounce delay Amplitude Mean current
Rsc
Vp = 3.0 V, Rm = 2 k Vp = 2.2 V, Rm = 2 k Ri = 300 , Rm = 2 k, T = - 10 to + 60 C Vp = 3.0 V, Rm = 640 Vp = 2.2 V, Rm = 640 Ri = 300 , Rm = 640 , T = - 10 to + 60 C Between motor pulses 100 mV applied between MOT1 and MOT2 From 90% Vp to 10% Vn
Ttst Vtst Itst
30 pF // 1 M load 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)
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EM1537
Timing Waveforms
Motor Drive Output in NORMAL OPERATION RESET MOT1 MOT2 pulse width half pulse period pulse period MTEST V n Vp Vn Vp Vn
Vp Vn
31.25 ms / 1.953 ms Motor Drive Output and Reset < 7.81 ms 32 Hz / 512 Hz Output Vp Vp half pulse period 5% Vn Vp Vn Vp Vn
RESET debounce delay MOT1 MOT2 MTEST
> 23.43 ms
FAST MOTOR TEST Mode, MTEST = V p
31.25 ms / 1.953 ms 32 Hz / 512 Hz Output 31.25 ms < T < 125 ms (16 Hz) 31.25 ms < T < 93.75 ms (32 Hz) (for a non-chopped motor pulse) Vp Vn Vp Vn Vp 62.50 ms or 31.25 ms Vn
MTEST MOT1 MOT2 0.122 ms Example of chopped motor pulse : MOT1 pulse width The chopper frequency is 1024 Hz and chopping ratio 1/8
0.9765 ms
Vp Vn
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EM1537
Functional Description
Oscillator (Pads OSCIN/OSCOUT) Time-base is a 32 kHz quartz crystal. Special care was taken at design of crystal oscillator and initial divider chain to achieve very low power consumption and a wide operating voltage range. Input and output capacitances are integrated on-chip; their values are metal mask selectable. The oscillator frequency can be adjusted with an external trimmer (CTR) connected on Pad OSCIN. Motor Drive Output (Pads MOT1, MOT2) The EM1537 contains two push-pull output buffers for driving a bipolar stepping motor. Between two motor pulses, the two p-channel devices are active for damping the motor. A special circuitry prevents transfer current spikes during switching. Reset Input (Pad RESET) The reset input is fully debounced with a debounce-delay between 7.8 ms and 23.4 ms. Pulling the RESET input to Vp, resets the frequency dividers and disables motor pulses. Motor pulses in progress when the RESET function is applied will be completed. After releasing the RESET pad from Vp the next motor pulse appears with a delay of one half motor cycle +/- 5% on the drive output MOT1 if the last pulse appeared on MOT2 and vice-versa. The RESET input has an internal pull-down. Test Mode (Pad MTEST) The Pad MTEST is a bidirectional port. In its input mode it is fully debounced with a debounce-delay between 31.25 ms and 62.5 ms. The MTEST pad fulfils two functions: - For normal operation the MTEST pad is left open. The circuit outputs a square wave signal of 32 Hz or 512 Hz (ftst) which can be used for tuning the oscillator frequency. - If the MTEST pad is connected to Vp the period of motor pulses changes either to 2x31.25 ms or 2x62.5 ms (mask option) while the motor pulse width and chopping remains unchanged (fast motor test). Factory Test (Pad TEST): Test pad for Wafer sorting at the EM-Microelectronic. It has a pull-up transistor.
Typical Operating Characteristics
140 120
Idyn [nA]
100 80 60 40 20 0 0.5 1 1.5 2 2.5 3 3.5 4
Vp [V]
Test Configuration
Reset Vn Test Vp CTR MTEST H1137 OSCIN MOT2 MOT1 Rm Vn RESET Vp
OSCOUT
Vp
Vp
Copyright (c) 2006, EM Microelectronic-Marin SA 10/06 - rev.A
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EM1537
Padout
232 454 878 0
760
4
3
2 9
1
522
H1537
5
0
6
7
8
Pad N 1 2 3 4 5 6 7 8 9
Pad Name Vn MTEST or RESET OSCIN OSCOUT Vp MOT2 MOT1 RESET or MTEST EMTEST (manufacturer testpad)
1056
X = -178 Y = -149
260
560
1234
Pad opening 90m x 90 m typical. Chip size is x=1234 m y=1056 m The X origin is the most left coordinate and the Y origin is the lower coordinates of the center pads. The lower left corner of the chip shows distances to origin. Ordering Information
EM1537 WW 11 - %%%
Customer Version: customer-specific number given by EM Microelectronic Thickness: 11 = 11 mils (280um) 10 = 10 mils (250um) (for other thickness, contact EM)
842 903
RESET and MTEST can be changed between pads 2 and 8 by metal mask
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Example: Delivery form /Thickness EM1537WS11-%%% Sawn wafer 11 mils EM1537WP10-%%% Die in waffle pack 10 mils Part number Package
Die form: WW = Wafer WS = Sawn Wafer/Frame WP = Waffle Pack
Please make sure to give the complete part number when ordering, including the 3-digit customer version. The customer version is made 3 digits %%% (e.g. 016, 021, etc.) Please contact EM- Microelectronic for other packages or Bumps.
EM Microelectronic-Marin SA (EM) makes no warranty for the use of its products, other than those expressly contained in the Company's standard warranty which is detailed in EM's General Terms of Sale located on the Company's web site. EM assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property of EM are granted in connection with the sale of EM products, expressly or by implications. EM's products are not authorized for use as components in life support devices or systems.
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