Ordering number : ENA2118A LC898212XA CMOS LSI AF Control LSI http://onsemi.com Overview The AF control device, LC898212XA (LC898212XA-MH), provides an ideal way to implement the reduced power consumption and the improved autofocus precision and speed (reduced convergence time) required in high-pixelcount camera modules for use in smartphones. The LC898212XA integrates on a single chip an equalizer circuit employing digital calculation, and it can be combined with position sensors to build a closed-loop actuator control system. Since closed-loop control provides better ability to maintain the control object than conventional open-loop systems and is not affected by position differences, the LC898212XA is ideal for use in AF systems used in a wide variety of cameras. A closed-loop system uses position sensors for position control, and power consumption is lower than with conventional open-loop control, which uses current values for position control. In addition, a new PWM drive system employed suppresses noise that could affect image quality while achieving reduced power consumption, making this IC ideal for use in mobile devices such as smartphones. The filter coefficients of the equalizer circuit can be adjusted to any values desired by making register settings via I2C communication. This makes it possible to build a control circuit optimized to the various types of actuators and thereby achieve faster autofocus (reduced convergence time) performance. The integrated ADC provides up to 10-bit precision for highly accurate AF position control. Also integrated on-chip are a constant current supply DAC for drive and an op-amp with adjustable gain for use with the position sensors indispensable for building a closed-loop control system. * I2C Bus is a trademark of Philips Corporation. Semiconductor Components Industries, LLC, 2013 June, 2013 91212HK/82912HKPC 20111107-S00001 No.A2118-1/5 LC898212XA Features • Built-in equalizer circuit using digital operation AF control equalize circuit Any coefficient can be specified by I2C I/F • I2C Interface • Built-in A/D converter Maximum 10-bit Input 2 channel • Built-in D/A converter 8-bit Output 2-channel (Hall offset, Constant current Bias) • Built-in OP Amp 1 channel Hall Amp • Built-in OSC 48MHz (Frequency adjustment function) • Built-in PWM pulse generator circuit PWM circuit for AF control • 1-chip motor driver Saturation drive H bridge 1 channel • Package WL-CSP 12-pin Lead-free, halogen-free • Supply voltage Logic unit: Internal core typ 1.2V (1.08V to 1.32V), AVDD (2.6V to 3.6V) Driver unit: VM (2.6V to 3.6V) Package Dimensions unit : mm (typ) 3440 TOP VIEW BOTTOM VIEW 0.4 0.285 SIDE VIEW 0.285 1 2 0.4 1.77 3 4 1.37 (0.43) B A 0.21 SIDE VIEW C 0.69 MAX 0.26 SANYO : WLP12(1.77x1.37) No.A2118-2/5 LC898212XA Block Diagram I2CDT I2CCK I2C I/F AVDD DA VM PGND BIASO H Bridge Driver OUT1 OUT2 OPINP Hall OPINM AD EQ PWM Modulation Output Control logic AVDD VDD OSC POR REG VDDO VSS No.A2118-3/5 LC898212XA Pin Description TYPE I INPUT P O OUTPUT B BIDIRECTION Power supply, GND NC I2C interface I2CCK I2CDT B B I2C Clock pin I2C Data pin D/A interface BIASO O D/A output (Hall bias input) Op-Amp interface OPINP OPINM I I Op-Amp input Op-Amp input Driver interface OUT1 OUT2 O O Actuator output pin Actuator output pin Power supply pin VDD VSS VDDO VM PGND P P P P P Digital power supply Digital GND LDO power supply out Motor power supply Power GND NOT CONNECT PIN TYPE “O” – Ensure that it is set to OPEN. PIN TYPE “I” – OPEN is inhibited. Ensure that it is connected to the VDD or VSS even when it is unused. (Please contact Our company for more information about selection of VDD or VSS.) PIN TYPE “B” – If you are unsure about processing method on the pin description of pin layout table, please contact us. Note that incorrect processing of unused pins may result in defects. If you have any question, please feel free to contact us. Pin Layout Circuit Name Number of Pins Circuit Name Number of Pins Analog 4 Driver 4 Logic 4 Backside pin layout diagram (Top View from the mold side) 4 VDDO VM PGND 3 AVDD I2CDT OUT1 2 OPINP I2CCK OUT2 1 VSS OPINM BIASO A B C No.A2118-4/5 LC898212XA ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. 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