R EM MICROELECTRONIC - MARIN SA EM1537 Low Power 32 kHz Circuit for Analog Quartz Watches Description Features 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. 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: -10°C to +60°C Available in chip form, SO8 package Applications Analog watches Driver for bipolar stepping motors Functional Diagram RESET Vn Vn RESET VP VP MOT1 CTR Rm (Stepping Motor) H1537 OSCIN OSCOUT MOT2 VP VP Operating range of Trimmer Capacitance: 3pF ≤ CTR ≤ 30 pF Copyright © 2006, EM Microelectronic-Marin SA 10/06 – rev.A 1 www.emmicroelectronic.com R EM1537 Current Versions Version 016 017 020 021 026 058 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 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 Min 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 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 6 MOT1 7 MOT2 8 MASTER RESET Copyright © 2006, EM Microelectronic-Marin SA 10/06 – rev.A MOTOR CONTROL 2 www.emmicroelectronic.com R EM1537 Handling Procedures 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 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. 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 kΩ; Motor coil resistance Rm = 2 kΩ; Supply source resistor Ri = 10 Ω; 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 Symbol Vp Idyn In Typ Max Unit 1.2 1.55 1.8 V 0.7 V 90 150 nA 250 350 nA Without motor and quartz 32 kHz 900mVpp sinus wave, forced on OSCIN/OSCOUT, TEST open With quartz, without motor, MTEST open, Ctr = 12 pF dIn/dRq Cin Cout Ctr Motordrivers Voltage across Motor Vmot Gm Vst Tst Rsc Rise and Fall time MTEST Input/Output Debounce delay Amplitude Mean current Min dVp Oscillator Transconductance Starting voltage Starting time Stability df/f*dVp Input capacitance Output capacitance Trimmer capacitance Short circuit impedance Conditions Ttst Vtst Itst 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 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 30 pF // 1 MΩ 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) Copyright © 2006, EM Microelectronic-Marin SA 10/06 – rev.A 3 2.6 nA/kΩ 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 2.5 1.35 1.00 1.4 1.1 V V 1.00 1.2 V 150 300 Ω 40 31.25 1.55 200 ns 62.5 70 250 ms Vpp nA 10 23.43 50 ms nA 7.81 www.emmicroelectronic.com R EM1537 Electrical Characteristics 3.0 Volt Vp = 3.0 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 Supply Supply voltage range Supply voltage drop during Motorpulse Mean dynamic current Mean current consumption Mean current consumption in variation with Rq of quartz Symbol Vp Idyn In Typ Max Unit 1.8 3.0 3.6 V 0.7 V 120 250 nA 200 350 nA Without motor and quartz 32 kHz 900mVpp sinus wave, forced on OSCIN/OSCOUT, TEST open With quartz, without motor, MTEST open, Ctr = 12 pF dIn/dRq Cin Cout Ctr Motordrivers Voltage across Motor Vmot Gm Vst Tst Rsc Rise and Fall time MTEST Input/Output Debounce delay Amplitude Mean current Min dVp Oscillator Transconductance Starting voltage Starting time Stability df/f*dVp Input capacitance Output capacitance Trimmer capacitance Short circuit impedance Conditions Ttst Vtst Itst 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 Vp = 3.0 V, Rm = 2 kΩ Vp = 2.2 V, Rm = 2 kΩ Ri = 300 Ω, Rm = 2 kΩ, T = - 10 to + 60 °C Vp = 3.0 V, Rm = 640 Ω Vp = 2.2 V, Rm = 640 Ω Ri = 300 Ω, Rm = 640 Ω, T = - 10 to + 60 °C Between motor pulses 100 mV applied between MOT1 and MOT2 From 90% Vp to 10% Vn 30 pF // 1 MΩ 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) Copyright © 2006, EM Microelectronic-Marin SA 10/06 – rev.A 4 2.5 1.8 2.6 nA/kΩ 15 umho V sec ppm/V pF pF pF 1 2 1.5 5 C +/- (0.1C + 0.5) C +/- (0.1C + 0.5) 3 30 2.69 1.97 2.84 2.08 V V 2.35 2.40 V 2.21 1.62 2.56 1.87 V 1.64 1.80 V 40 31.25 2.6 215 Ω 200 ns 62.5 70 250 ms Vpp nA 10 23.43 50 ms nA 7.81 www.emmicroelectronic.com R EM1537 Timing Waveforms Motor Drive Output in NORMAL OPERATION RESET V n Vp MOT1 Vn Vp MOT2 half pulse period pulse width pulse period MTEST Vn Vp Vn 31.25 ms / 1.953 ms Motor Drive Output and Reset < 7.81 ms RESET 32 Hz / 512 Hz Output Vp > 23.43 ms debounce delay Vp MOT1 half pulse period ± 5% MOT2 Vn Vp Vn Vp MTEST Vn 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 MTEST Vn Vp MOT1 Vn Vp MOT2 0.122 ms Example of chopped motor pulse : 0.9765 ms 62.50 ms or 31.25 ms Vn Vp MOT1 Vn pulse width The chopper frequency is 1024 Hz and chopping ratio 1/8 Copyright © 2006, EM Microelectronic-Marin SA 10/06 – rev.A 5 www.emmicroelectronic.com R EM1537 Typical Operating Characteristics 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. 140 Idyn [nA] 120 100 80 60 40 20 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. 0 0.5 1 1.5 2 2.5 3 3.5 4 Vp [V] 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 Configuration Reset Vn Vp RESET Vn Test MTEST Vp CTR 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). MOT1 Rm H1137 OSCIN OSCOUT MOT2 Vp Vp Factory Test (Pad TEST): Test pad for Wafer sorting at the EM-Microelectronic. It has a pull-up transistor. Copyright © 2006, EM Microelectronic-Marin SA 10/06 – rev.A 6 www.emmicroelectronic.com R EM1537 878 454 232 0 Padout Pad N° 1 2 3 4 5 6 7 8 9 760 4 3 2 1 522 1056 9 H1537 5 6 7 8 RESET and MTEST can be changed between pads 2 and 8 by metal mask 842 903 560 260 X = -178 Y = -149 24 0 Pad Name Vn MTEST or RESET OSCIN OSCOUT Vp MOT2 MOT1 RESET or MTEST EMTEST (manufacturer testpad) 1234 Pad opening 90µm x 90 µm typical. Chip size is x=1234 µm y=1056 µm 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 Example: - %%% Customer Version: customer-specific number given by EM Microelectronic Delivery form /Thickness EM1537WS11-%%% Sawn wafer 11 mils EM1537WP10-%%% Die in waffle pack 10 mils Part number Thickness: 11 = 11 mils (280um) 10 = 10 mils (250um) (for other thickness, contact EM) 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. Copyright © 2006, EM Microelectronic-Marin SA 10/06 – rev.A 7 www.emmicroelectronic.com