PCA1486 Datasheet | NXP Semiconductors

FEATURES - 32 k Hz oscillator, amplitude regulated with excellent frequency stability - High immunity of the oscillator to leakage currents - Time calibration electrically programmable and reprogrammable (via EEPROM) - A quartz crystal is the only external ponent required - Very low current consumption; typically 170 n A - Output for bipolar stepping motors of different types - Up to 50% reduction in motor current pared with conventional circuits, by self adaption of the motor pulse width in accordance with the required torque of the motor ORDERING INFORMATION TYPE NUMBER PCA1485U/7 PCA1486U/7 PCA1486U/10 PCA1487U/10 Note PACKAGE(1) NAME - - - - DESCRIPTION chip with bumps on tape chip with bumps on tape chip on foil chip on foil GENERAL DESCRIPTION PCA148x series - No loss of motor steps possible because of on-chip detection of the induced motor voltage - 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. The PCA148x series devices are CMOS integrated circuits specially suited for battery-operated, quartz-crystal-controlled wrist-watches, with a bipolar stepping motor. VERSION - - - - 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. PINNING SYMBOL VSS TEST OSC IN OSC OUT VDD M1 M2 RESET PIN 1 2 3 4 5 6 7 8 DESCRIPTION ground (0 V) test output oscillator input oscillator output supply voltage motor 1 output motor 2 output reset input OSC OUT 4 MSA968 VSS TEST OSC IN 1 2 8 7 RESET M2 M1 V DD PCA148x T 3 6 5 Fig.1 Pin configuration, PCA148x T, (PMFP8). 1998 Apr 21 Philips Semiconductors Product specification 32 k Hz watch circuits with adaptive motor pulse FUNCTIONAL DESCRIPTION AND TESTING The motor output delivers pulses of six different stages depending on...