INTEGRATED CIRCUITS DATA SHEET PCA146x series 32 kHz watch circuits with adaptive motor pulse Product specification Supersedes data of 1998 Mar 18 File under Integrated Circuits, IC16 1998 Apr 21 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series FEATURES GENERAL DESCRIPTION • 32 kHz oscillator, amplitude regulated with excellent frequency stability The PCA146x series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches, with a bipolar stepping motor. • High immunity of the oscillator to leakage currents • Time calibration electrically programmable and reprogrammable (via EEPROM) • A quartz crystal is the only external component required • Very low current consumption; typically 170 nA • Output for bipolar stepping motors of different types • Up to 50% reduction in motor current compared with conventional circuits, by self adaption of the motor pulse width to match the required torque of the motor • No loss of motor steps possible because of on-chip detection of the induced motor voltage • Detector for lithium or silver-oxide battery voltage levels • Indication for battery end-of-life • Stop function for accurate timing • Power-on reset for fast testing • Various test modes for testing the mechanical parts of the watch and the IC. ORDERING INFORMATION TYPE NUMBER PACKAGE(1) NAME DESCRIPTION VERSION PCA1461U − chip in tray − PCA1461U/10 − chip on foil − PCA1462U − chip in tray − PCA1462U/7 − chip with bumps on tape − PCA1462U/10 − chip on foil − PCA1463U − chip in tray − PCA1463U/10 − chip on foil − PCA1465U/10 − chip on foil − PCA1465U/7 − chip with bumps on tape − PCA1467U/10 − chip on foil − Note 1. Figure 1 and Chapter “Package outline” show details of standard package, available for large orders only. Chapter “Chip dimensions and bonding pad locations” shows exact pad locations for other delivery formats. 1998 Apr 21 2 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series PINNING SYMBOL PIN DESCRIPTION VSS 1 ground (0 V) TEST 2 test output OSC IN 3 oscillator input OSC OUT 4 oscillator output VDD 5 supply voltage M1 6 motor 1 output M2 7 motor 2 output RESET 8 reset input 1 TEST 2 8 RESET 7 M2 PCA146xT OSC IN 3 6 M1 OSC OUT 4 5 V DD MSA937 Fig.1 Pin configuration, PCA146xT, (PMFP8). In the lithium mode, the ON state of the motor pulse is reduced by 18.75% of the duty factor tDF (Fig.4) to compensate for the increase in the voltage level. FUNCTIONAL DESCRIPTION AND TESTING The motor output delivers pulses of six different stages depending on the torque required to turn the motor (Figs. 3 and 4). Every motor pulse is followed by a detection phase which monitors the waveform of the induced motor voltage. When a step is missed a correction sequence will be started (Fig.2). After a RESET the circuit always starts and continues with stage 1, when all motor pulses have been executed. A failure to execute all motor pulses results in the circuit going into stage 2, this sequence will be repeated through to stage 8. Motor pulses When the motor pulses at stage 5 are not large enough to turn the motor, stage 8 is implemented for a maximum of 8 minutes with no attempt to keep current consumption low. After stage 8 has been executed the procedure is repeated from RESET. The circuit produces motor pulses of six different stages (stage 1 to 5, stage 8). Each stage has two independent modes: silver-oxide and lithium. The voltage level of VDD determines which mode is selected (see Section “Voltage level detector”). The circuit operates for 8 minutes at a fixed stage, if every motor pulse is executed. The next 480 motor pulses are then produced at the next lower stage unless a missing step is detected. If a step is missed a correction sequence is produced and for a maximum of 8 minutes the motor pulses are increased by one stage. Stages 1 to 5 (both modes) are used in normal operation, stage 8 occurs under the following conditions: • Correction pulse after a missing step (both modes) • End-of-life mode • If stage 5 is not enough to turn the motor (both modes). In the silver-oxide mode, the ON state of the motor pulse varies between 56.25% and 100% of the duty factor tDF = 977 µs depending on the stage (Fig.3). It increases in steps of 6.25% per stage. 1998 Apr 21 VSS 3 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse DETECTION MOTOR PULSE PCA146x series POSSIBLE CORRECTION SEQUENCE VM1 - M2 tP tD MSA942 tC tT Fig.2 Possible motor output waveform in normal operation with motor connected. 1998 Apr 21 4 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... t SOFF t ONL t ON = t SON t DF = t DF t SOFF STAGE 1 56.25 % STAGE 2 62.50 % STAGE 3 68.75 % STAGE 4 5 75.00 % STAGE 5 t DF Philips Semiconductors t DF = 977 µs t SON 32 kHz watch circuits with adaptive motor pulse 1998 Apr 21 t SONF = 488 µs 81.25 % STAGE 8 100.00 % t P3 = 3.9 ms t P2 = 5.86 ms t P1 = 7.81 ms Product specification Fig.3 Motor pulses in the silver-oxide mode (VDD = 1.55 V). PCA146x series tOFF for stage 1 to 5 = 488 µs − stage × 61 µs tON for stage 1 to 5 = 488 µs + stage × 61 µs MSA947 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... t LOFF t DF = 977 µs t AOFF STAGE 1 t ONL t ON = t DF t LOFF t LOFF t DF 37.50 % STAGE 2 43.75 % STAGE 3 50.00 % STAGE 4 56.25 % 6 STAGE 5 62.50 % STAGE 8 Philips Semiconductors t AOFF = 183 µs 32 kHz watch circuits with adaptive motor pulse 1998 Apr 21 t LONF = 244 µs 81.25 % t P3 = 3.9 ms t P2 = 5.86 ms t P1 = 7.81 ms Product specification Fig.4 Motor pulses in the lithium mode (VDD = 2.1 V). PCA146x series tOFF for stage 1 to 5 = 672 µs − stage × 61 µs tON for stage 1 to 5 = 305 µs + stage × 61 µs MSA946 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series Voltage level detector Detection of motor movement The supply voltage is compared with the internal voltage reference VLIT and VEOL every minute. The first voltage level detection is carried out 30 ms after RESET. After a motor pulse, the motor is short-circuited to VDD for 1 ms. Afterwards the energy in the motor inductor will be dissipated to measure only the current generated by the induced motor voltage. During the time tDI (dissipation of energy time) all switches shown in Fig.5 are open to reduce the current as fast as possible. The current will now flow through the diodes D3 and D2, or D4 and D1. Then the first of 52 possible measurement cycles (tMC) starts to measure the induced current. When a lithium voltage level is detected (VDD ≥ VLIT), the circuit starts operating in the lithium mode (Fig.4). When the detected VDD voltage level is between VLIT and VEOL, the circuit operates in the silver-oxide mode (Fig.3). If the battery end-of-life is detected (VDD < VEOL), the detection and stage control is switched OFF and the waveform produced is an unchopped version of the stage 8 waveform. To indicate this condition the waveform is produced in bursts of 4 pulses every 4 s. VDD P1 D1 L1 D2 M1 N1 MOTOR P2 M2 D3 L2 D4 N2 MSA941 Fig.5 Motor driving and detecting circuit. 1998 Apr 21 7 V SS Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series The waveform of the induced current must enable all these measurements within the time tD after the end of a positive motor pulse in order to be accepted as a waveform of an executed motor pulse. Detection criteria The PCA146x uses current detection in two defined parts of the detection phase to determine if the motor has moved (refer to Figs 6 and 7). The detection criteria are: If the detection criterion is satisfied earlier, a measurement cycle will not be started and the switches P1 and P2 stay closed, the motor is switched to VDD. part 1 • Minimum value of P = 1; where P = number of measured positive current polarities after tDI. part 2 Every measurement cycle (tMC) has 4 phases. These are detailed in Table 1. • Minimum value of N = 2; where N = number of measured positive current polarities since the first negative current polarity after part 1 was detected (see Fig.6). Note that detection and pulse width control will be switched OFF when the battery voltage is below the end-of-life voltage (VEOL), or if stage 5 is not sufficient to turn the motor. If the opposite polarity is measured in one part, the internal counter is reset, so the results of all measurements in this part are ignored. Table 1 Measurement cycle SYMBOL PHASE DESCRIPTION tM1 1 During tM1 the switches P1 and P2 are closed in order to switch the motor to VDD, so the induced current flows unaffected through the motor inductance. tM2 2 Measures the induced current; during a maximum time tM2 all switches are open until a change is sensed by one of the level detectors (L1, L2). The motor is short-circuited to VDD. Depending on the direction of the interrupted current: • The current flows through diodes D3 and D2, causing the voltage at M1 to decrease in relation to M2; • The current flows through diodes D4 and D1, causing the voltage at M2 to decrease in relation to M1. A successfully detected current polarity is normally characterized by a short pulse of 0.5 to 10 µs with a voltage up to ±2.1 V, failed polarity detection by the maximum pulse width of 61 µs and a voltage of ±0.5 V (see Fig.7). tM3 3 The switches P1 and P2 remain closed for the time tM3. tM4 4 If the circuit detects fewer pulses than P and N respectively, a pulse of the time tM4 occurs to reduce the induced current. Therefore P2 and P1 are opened and N1 and N2 are closed. Otherwise P1 and P2 remain closed. 1998 Apr 21 8 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse MOTOR PULSE PCA146x series DETECTION PHASE I M1 - M2 part 1 detection criterion is satisfied part 2 t t DS t DI tP MSA944 tD Fig.6 Typical current waveform of a successfully executed motor pulse. DETECTION PHASE MOTOR PULSE V M1 - M2 tM1 = 244 µs t M3 t DS t DI tMC = 488 µs t M4 t M1 t M2 = 61 µs t M2 = 61 µs tD tP current polarity not measured detection criterion is satisfied VM1 t M2 = 61 µs tMC = 488 µs t M1 = 244 µs t DS t DI t M2 = 61 µs Fig.7 Detection phase of the current waveform in Fig.6. 1998 Apr 21 9 t M1 = 244 µs MSA945 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series Correction sequence (see Fig.8) If a missing step is detected, a correction sequence is produced. This consists of a small pulse (tC1) which gives the motor a defined position and after 29.30 ms a pulse of stage 8 (tC2) to turn the motor. MOTOR PULSE DETECTION tP tD CORRECTION SEQUENCE VM1 - M2 t C1 = 977 µs t C2 = t P t C = 30.27 ms tP Fig.8 Correction sequence after a missing motor step with motor connected. 1998 Apr 21 10 MSA943 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse 3. VDD is decreased to 2.5 V during a motor pulse to initialize a storing sequence. Time calibration Taking a normal quartz crystal with frequency 32768kHz, frequency deviation (∆f/f) of ±15 × 10−6 and CL = 8.2 pF; the oscillator frequency is offset (by using non-symmetrical internal oscillator input and output capacitances of 10 pF and 15 pF) such that the frequency deviation is positive-only. This positive deviation can then be compensated for to maintain time-keeping accuracy. 4. The first VDD pulse to 5.1 V erases the contents of EEPROM. 5. When the EEPROM is erased a logic 1 is at the TEST pin. 6. VDD is increased to 5.1 V to read the data by pulsing VDD n times to 4.5 V. After the n edge, VDD is decreased to 2.5 V. Once the positive frequency deviation is measured, a corresponding number ‘n’ (see Table 2) can be programmed into the device’s EEPROM. This causes n pulses of frequency 8192 Hz to be inhibited every minute of operation, which achieves the required calibration. 7. VDD is increased to 5.1 V to store n bits in the EEPROM. 8. VDD is decreased to 2.5 V to terminate the storing sequence and to return to operating mode. The programming circuit is shown in Fig.9. The required number n is programmed into EEPROM by varying VDD according to the steps shown in Fig.10, which are explained below: 9. VDD is increased to 5.1 V to check writing from the motor pulse period tT3. 10. VDD is decreased to the operation voltage between two motor pulses to return to operating mode. (Decreasing VDD during the motor pulse would restart the programming mode). 1. The positive quartz frequency deviation (∆f/f) is measured, and the corresponding values of n are found according to Table 2. The time calibration can be reprogrammed up to 100 times. 2. VDD is increased to 5.1 V allowing the contents of the EEPROM to be checked from the motor pulse period tT3 at nominal frequency. Table 2 PCA146x series Quartz crystal frequency deviation, n and tT3 FREQUENCY DEVIATION ∆f/f (× 10−6) NUMBER OF PULSES (n) tT3 (ms) 0(1) 0 31.250(2) +2.03 1 31.372 +4.06 2 31.494 . . . . . . . . . +127.89 63 38.936 SIGNAL GENERATOR V SS TEST OSC IN 1 8 2 7 PCA146x SERIES Notes M2 M 3 6 4 5 32 kHz OSC OUT RESET M1 VDD MSA940 1. Increments of 2.03 × 10−6/step. 2. Increments of 122 µs/step. Fig.9 Circuit for programming the time calibration. 1998 Apr 21 11 This text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here in _white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader.This text is here inThis text is here in white to force landscape pages to be rotated correctly when browsing through the pdf in the Acrobat reader. white to force landscape pages to be ... DATA INPUT CHECKING STORING I DD ∆ V DDP 1 2 3 t T3 n 5.1 4.5 9 10 t edge = 1 µs 12 VDD (V) 0.1 ms min. 2.5 1 2 3 4 5 6 7 8 9 10 Philips Semiconductors ERASURE 32 kHz watch circuits with adaptive motor pulse 1998 Apr 21 CONTENT CHECKING 1.5 t E = 5 ms t S = 5 ms 0 (VSS) (1) (1) MSA948 Product specification Fig.10 VDD for programming. (1) PCA146x series (1) Rise and fall time should be greater than 400 µs/V for immediately correct checking. (1) Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series Test 1, VDD > VEOL. Normal function takes place except that the motor pulse period is tT1 = 125 ms instead of tT, and the motor pulse stage is reduced every second instead of every 8 minutes. At TEST a speeded-up 8 minute signal is available. Power-on reset For correct operation of the Power-on reset the rise time of VDD from 0 V to 2.1 V should be less than 0.1 ms. All resetable flip-flops are reset. Additionally the polarity of the first motor pulse is positive: VM1 − VM2 ≥ 0 V. Test 2, VDD < VEOL. Motor pulses of stage 8 are produced, with a time period of tT2 = 31.25 ms. Customer testing Test and reset modes are terminated by disconnecting the RESET pin. An output frequency of 32 Hz is provided at RESET (pin 8) to be used for exact frequency measurement. Every minute a jitter occurs as a result of the inhibition, which occurs 90 to 150 ms after disconnecting the RESET from VDD. Test 3, VDD > 5.1 V. Motor pulses of stage 8 are produced, with a time period of tT3 = 31.25 ms and n × 122 µs to check the contents of the EEPROM. At TEST a speeded-up cycle for motor pulse period signal tT is available at 1024 times its normal frequency. Decreasing VDD voltage level to lower than 2.5 V between two motor pulses returns the circuit to normal operating conditions. Connecting the RESET to VDD stops the motor pulses leaving them in a 3-state mode and sets the motor pulse width for the next available motor pulse to stage 1 in the silver-oxide mode. A 32 Hz signal without jitter is produced at the TEST pin. Debounce time RESET = 14.7 to 123.2 ms. Connecting RESET to VSS activates Tests 1 and 2 and disables the inhibition. AVAILABLE TYPES Refer to Chapters “Ordering information” and “Functional description and testing”. SPECIFICATIONS SHORT TYPE NUMBER DELIVERY FORMAT(1) PERIOD tT (s) PULSE WIDTH tP (ms) 1461 U; U/10 1 1462 U; U/7; U/10 1463 EEPROM BATTERY EOL DETECTION P=1 N=2 yes yes 1.5 V and 2.1 V Lithium max. 100 81 P=1 N=2 yes yes 1.5 V and 2.1 V Lithium 3.9 max. 100 81 P=1 N=2 yes yes 1.5 V and 2.1 V Lithium 1 5.8 max. 100 P=1 N=2 yes no 1.5 V 1 7.8 max. 100 P=1 N=2 yes no 1.5 V DRIVE (%) DETECTION CRITERION 7.8 max. 100 81 1 5.8 U; U/10 1 1465 U/10; U/7 1467 U/10 Note 1. U = Chip in tray; U/7 = chip with bumps on tape; U/10 = chip on foil. 1998 Apr 21 13 REMARKS Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER VDD supply voltage VI all input voltages CONDITIONS MIN. VSS = 0 V; note 1 MAX. UNIT −1.8 +6 V VSS VDD V output short-circuit duration indefinite Tamb operating ambient temperature −10 +60 °C Tstg storage temperature −30 +100 °C Note 1. Connecting the battery with reversed polarity does not destroy the circuit, but in this condition a large current flows, which will rapidly discharge the battery. HANDLING Inputs and outputs are protected against electrostatic discharges in normal handling. However, to be totally safe, it is advisable to take handling precautions appropriate to handling MOS devices. Advice can be found in “Data Handbook IC16, General, Handling MOS Devices”. CHARACTERISTICS VDD = 1.55 V; VSS = 0 V; fosc = 32.768 kHz; Tamb = 25 °C; crystal: RS = 20 kΩ; C1 = 2 to 3 fF; CL = 8 to 10 pF; C0 = 1 to 3 pF; unless otherwise specified. Immunity against parasitic impedance = 20 MΩ between adjacent pins. SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT Supply VDD1 supply voltage Tamb = −10 to +60 °C 1.2 1.55 2.5 V ∆VDD supply voltage variation transient within 1.2 V and 2.5 V − − 0.25 V VDD2 supply voltage programming 5.0 5.1 5.2 V ∆VDDP supply voltage pulse variation programming 0.55 0.6 0.65 V IDD1 supply current between motor pulses − 170 260 nA IDD2 supply current VDD = 2.1 V − 190 300 nA IDD3 supply current stop mode; pin 8 connected to VDD − 180 280 nA IDD4 supply current VDD = 2.1 V − 220 360 nA IDD5 supply current Tamb = −10 to +60 °C − − 600 nA Motor output Vsat saturation voltage Σ (P + N) RM = 2 kΩ; Tamb = −10 to +60 °C − 150 200 mV Zo(sc) output short-circuit impedance between motor pulses Itransistor < 1 mA − 200 300 Ω 1998 Apr 21 14 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse SYMBOL PARAMETER CONDITIONS PCA146x series MIN. TYP. MAX. UNIT Oscillator VOSC ST starting voltage gm transconductance tosc start-up time Vi(p-p) ≤ 50 mV ∆VDD = 100 mV 1.2 − − V 6 15 − µS − 1 − 10−6 s 10−6 ∆f/f frequency stability − 0.05 × Ci input capacitance 8 10 12 pF Co output capacitance 12 15 18 pF 0.3 × Voltage level detector VLIT threshold voltage 1.62 1.80 1.98 V VEOL threshold voltage 1.30 1.38 1.46 V ∆VEOL hysteresis of threshold − 10 − mV TCEOL temperature coefficient − −1 − mV/K − 32 − Hz 1.4 − − V Reset input fo output frequency ∆Vo output voltage swing tedge edge time R = 1 MΩ; C = 10 pF − 1 − µs Iim peak input current note 1 − 320 − nA Ii(av) average input current − 10 − nA R = 1 MΩ; C = 10 pF Note 1. Duty factor is 1 : 32 and RESET = VDD or VSS. 1998 Apr 21 15 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series TIMING PARAMETERS SYMBOL PARAMETER SECTION VALUE motor pulse (Figs 2, 3 and 4) 1 OPTION UNIT tT cycle for motor pulse (note 1) tP motor pulse width 7.81 3.9 or 5.9 ms tDF duty factor 977 − µs tONL last duty factor on 61 to 305 − µs tv voltage detection cycle level mode 60 − s tSON duty factor on silver-oxide mode (Fig.3) 550 to 794 − µs tSOFF duty factor off 427 to 183 − µs tSONF first duty factor on 488 − µs tAOFF additional duty factor off 183 − µs tLON duty factor on 305 to 611 − µs tLOFF duty factor off 672 to 366 − µs tLONF first duty factor on 244 − µs tE EOL sequence 4 − s lithium mode (Fig.4) end-of-life mode 5, 10, 12 or 20 s tE1 motor pulse width tP − ms tE2 time between pulses 31.25 − ms tD detection sequence 4.3 to 28.3 − ms detection (Fig.7) tDS short-circuited motor 977 − µs tDI dissipation of energy 977 − µs tMC measurement cycle 488 − µs tM1 phase 1 244 − µs tM2 phase 2 (measure window) 61 − µs tM3 phase 3 122 − µs tM4 phase 4 61 − µs P positive current polarities 1 P<N N negative current polarities 2 2 to 6 tC correction sequence tP + 30.27 − tC1 small pulse width 977 − µs tC2 large pulse width tP − ms cycles for motor-pulses in: correction sequence (Fig.8) ms testing tT1 test 1 125 − ms tT2 test 2 31.25 − ms tT3 test 3 31.25 to 39 − ms 14.7 to 123.2 − ms tDEB Fig.10 debounce time for RESET = VDD Note 1. No option available when EOL indication is required. 1998 Apr 21 16 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series CHIP DIMENSIONS AND BONDING PAD LOCATIONS y OSC OUT OSC IN TEST V SS PCA146xU SERIES 1.44 mm 0 0 x VDD M1 M2 RESET 2.02 mm MSA938 Chip area: 2.91 mm2. Bonding pad dimensions: 110 µm × 110 µm. Chip thickness: 200 ±25 µm, with bumps: 270 ±25 µm. Fig.11 Bonding pad locations, PCA146xU series; 8 terminals. Table 3 Bonding pad locations (dimensions in µm) All x/y coordinates are referenced to bottom left pad (VDD), see Fig.11. PAD x y 1290 1100 TEST 940 1100 OSC IN 481 1100 OSC OUT −102 1100 VDD 0 0 M1 578 0 M2 930 0 VSS RESET chip corner (max. value) 1998 Apr 21 1290 0 −497.5 −170 17 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series APPLICATION INFORMATION 1.55 V handbook, full pagewidth V SS TEST 1 2 OSC OUT 7 PCA146x SERIES (1) OSC IN 8 RESET C M(2) M2 M 3 6 4 5 M1 (2) CM VDD MSA939 (1) Quartz crystal case should be connected to VDD. Stray capacitance and leakage resistance from RESET, M1 or M2 to OSC IN should be less than 0.5 pF or larger than 20 MΩ. (2) Motor, probe and stray capacitance from M2 or M1 to VDD or VSS should be less than CM = 80 pF for correct operation of the detection circuit. Driving the motor at its minimum energy, probe and stray capacitance must be avoided. Fig.12 Typical application circuit diagram. 1998 Apr 21 18 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series PACKAGE OUTLINE PMFP8: plastic micro flat package; 8 leads (straight) SOT144-1 E D X c m t n HE 8 5 Q2 A2 Q1 pin 1 index L detail X 1 4 e w M b 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A2 b c D (1) E (1) e HE L m max. n max. Q1 Q2 t w mm 0.90 0.70 0.40 0.25 0.19 0.12 3.1 2.9 3.1 2.9 0.80 4.6 4.4 0.75 0.26 0.3 0.40 0.30 0.40 0.30 0.95 0.1 Note 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. OUTLINE VERSION REFERENCES IEC JEDEC EIAJ ISSUE DATE 94-01-25 95-01-24 SOT144-1 1998 Apr 21 EUROPEAN PROJECTION 19 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series SOLDERING Wave soldering Introduction Wave soldering techniques can be used for all SO packages if the following conditions are observed: There is no soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and surface mounted components are mixed on one printed-circuit board. However, wave soldering is not always suitable for surface mounted ICs, or for printed-circuits with high population densities. In these situations reflow soldering is often used. • A double-wave (a turbulent wave with high upward pressure followed by a smooth laminar wave) soldering technique should be used. • The longitudinal axis of the package footprint must be parallel to the solder flow. • The package footprint must incorporate solder thieves at the downstream end. This text gives a very brief insight to a complex technology. A more in-depth account of soldering ICs can be found in our “IC Package Databook” (order code 9398 652 90011). During placement and before soldering, the package must be fixed with a droplet of adhesive. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. The package can be soldered after the adhesive is cured. Reflow soldering Reflow soldering techniques are suitable for all SO packages. Maximum permissible solder temperature is 260 °C, and maximum duration of package immersion in solder is 10 seconds, if cooled to less than 150 °C within 6 seconds. Typical dwell time is 4 seconds at 250 °C. Reflow soldering requires solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the printed-circuit board by screen printing, stencilling or pressure-syringe dispensing before package placement. A mildly-activated flux will eliminate the need for removal of corrosive residues in most applications. Several techniques exist for reflowing; for example, thermal conduction by heated belt. Dwell times vary between 50 and 300 seconds depending on heating method. Typical reflow temperatures range from 215 to 250 °C. Repairing soldered joints Fix the component by first soldering two diagonallyopposite end leads. Use only a low voltage soldering iron (less than 24 V) applied to the flat part of the lead. Contact time must be limited to 10 seconds at up to 300 °C. When using a dedicated tool, all other leads can be soldered in one operation within 2 to 5 seconds between 270 and 320 °C. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 minutes at 45 °C. 1998 Apr 21 20 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse PCA146x series DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. 1998 Apr 21 21 Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse NOTES 1998 Apr 21 22 PCA146x series Philips Semiconductors Product specification 32 kHz watch circuits with adaptive motor pulse NOTES 1998 Apr 21 23 PCA146x series Philips Semiconductors – a worldwide company Argentina: see South America Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. +61 2 9805 4455, Fax. +61 2 9805 4466 Austria: Computerstr. 6, A-1101 WIEN, P.O. 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The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. Printed in The Netherlands 415108/1200/04/pp24 Date of release: 1998 Apr 21 Document order number: 9397 750 03769