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 4731A–CLOCK–06/03 1 Pad Configuration Figure 1. Pinning C4 C3 C2 C1 VDD (1) OSCIN OSCOUT (1) VSS e1466D TEST (2) MOT2 MOT1 (2) MOT1 (1) The (2) pads VDD and OSCOUT are interchangeable per mask option The pads TEST and MOT1 are interchangeable per mask option Pin Description 2 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 e1466D 4731A–CLOCK–06/03 e1466D Functional Descripion Oscillator An oscillator inverter with feedback resistor is provided to generate the 32768 Hz clock frequency. 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 capacitor 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 values 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 Table 1. Frequency Trimming Table Capacitor Pads Motor Drive Output C4 C3 C2 C1 Trimming Step 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 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 (TM): 125, 250, 500 ms and 2, 16 s Available max. pulse widths (tM): 15, 6, 23.4, 31.25, 46.9 ms and 1 s Available motor periods for motor test (TMT): 250, 500 ms and 1 s Note: The following constraints for combination of motor period and pulse widths have to be considered: TM > 4 ´ tM, TMT > 4 ´ tM or alternatively TM = 2 ´ tM, TMT = 2 ´ tM 3 4731A–CLOCK–06/03 Test Functions For test purposes, the TEST pad is open. With a high resistance probe (R ³ 10 M W , C ³ 20 pF), a test frequency fTEST of 128 Hz can be measured at the TEST pad. Connecting TEST (for at least 32 ms) to VDD changes the motor period from the selected value to TMT (mask-selectable) while the pulse width remains unaffected. This feature can be used for testing 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 VSS -0.3 to 5 V V Input voltage range, all inputs VIN (VSS - 0.3 V) £ VIN £ (VDD + 0.3 V) V Output short-circuit duration indefinite 125 mW Tamb -20 to +70 °C Tstg -40 to +125 °C Tsld 260 °C Power dissipation (DIL package) Ptot Operating ambient temperature range Storage temperature range Lead temperature during soldering at 2 mm distance, 10 s 4 e1466D 4731A–CLOCK–06/03 e1466D Operating Characteristics VSS = 0 V, VDD = 1.5 V, Tamb = +25°C, unless otherwise specified. All voltage levels are measured with reference to VSS. Test crystal as specified below. Parameters Test Conditions Symbol Min. Typ. 1.5 Operating voltage VDD 1.1 Operating temperature Tamb -20 R1 = ¥ (2) Operating current IDD 2 Max. Unit 2.2 V +70 °C 5 mA Motor Drive Output VDD = 1.2 V, R1 = 200 W Motor output current IM ±4.3 mA Motor period TM See option list Motor period during motor test TMT See option list tM See option list Motor pulse width Oscillator VSTART Startup voltage Within 2 s Frequency stability DVDD = 100 mV, VDD = 1.1 to 2.2 V Integrated input capacitance (3) Integrated output capacitance Integrated capacitance for bond option (4) 1.2 2.2 Df/f 1 COSCIN See option list COSCOUT See option list C1 C2 C3 C4 3 4 5 6 V ppm pF pF pF pF TEST Input Input current TEST = VDD peak current ITINH 0.6 3 10 µA Input current TEST = VSS peak current ITINL -0.6 -3 -10 µA tTIN 23.4 31.2 ms Input debounce delay Notes: 1. 2. 3. 4. Typical parameters represent the statistical mean values See test circuit Values can be selected in 1 pF steps. A total capacitance (COSCIN + COSCOUT) of 38 pF is available These values are valid for 10 pF quartz applications. For CL = 12.5 pF these values change to 4.5, 6, 7.5, 9 pF Figure 2. Functional Test VDD C4 C3 C2 C1 OSCIN VSS OSCOUT e1466D TEST MOT2 R1 MOT1 MOT1 5 4731A–CLOCK–06/03 Test Crystal Specification Oscillation frequency Series resistance Static capacitance Dynamic capacitance Load capacitance fOSC = 32768 Hz RS = 30 kW C0 = 1.5 pF C1 = 3.0 fF CL optionally 10 or 12.5 pF Figure 3. Motor Output Signal During Normal Operation and During Motor Test Detail a VDD VSS TEST MOT1 VDD VSS tM MOT2 VDD VSS TM TMT Detail a: 1/fTEST Figure 4. Typical Trimming Curve Characteristic for TM of 2 s 2.00006 Motor Period (s) 2.00005 2.00004 COX = 1.05 COX = 1.00 COX = 0.95 2.00003 2.00002 2.00001 2.00000 1.99999 1.99998 1.99997 1.99996 1.99995 1.99994 1.99993 1.99992 1.99991 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Trimming Step COX means frequency deviation due to production process variations. Trimming inputs C1 ... C4 are binary weighted, i.e., C1 ... C4 = 0 corresponds to trimming step 0 C1 ... C4 = 1 corresponds to trimming step 15 LSB = C1 6 e1466D 4731A–CLOCK–06/03 e1466D Ordering Information Table 2. Option List e1466Dx Option Motor Load Capacitance Integrated Capacitance Pulse (tM) ms Test (TMT) ms COSCIN(1) COSCOUT(1) C1 C2 C3 C4 x Cycle (TM) s pF pF pF pF pF pF pF A 2 46.9 250 9 20 3 4 5 6 10 AO 2 46.9 250 9 20 3 4 5 6 10 FO 0.25 62.5 2000 9 20 3 4 5 6 10 HO 2 1000 500/ 250 9 20 3 4 5 6 10 Note: 1. On-chip stray capacitance included Option Pad Designation x Pad 1 A AO Pad 2 Pad 3 Pad 4 Pad 5 Pad 6 Pad 7 Pad 8 Pad 8 Pad 10 Pad 11 Pad 12 OSCIN OSCOUT MOT2 MOT1 MOT1 TEST VSS VDD C4 C3 C2 C1 OSCIN OSCOUT MOT2 MOT1 MOT1 TEST VSS VDD C4 C3 C2 C1 C4 C3 C2 C1 C4 C3 C2 C1 FO OSCIN OSCOUT MOT2 MOT1 MOT1 TEST VSS VDD HO OSCIN OSCOUT MOT2 MOT1 MOT1 TEST VSS VDD 7 4731A–CLOCK–06/03 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131 Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 1150 East Cheyenne Mtn. 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