ML9298 Datasheet | OKI Electric

DESCRIPTION The ML9298 is a 12-hour system clock IC that drives 1/2 duty fluorescent display tubes. It has a wide range of power supply using an oscillation source of 4.194304 MHz. The ML9298 has a time adjustment function in hour, minute and 30-minute units, and the function has two adjustment modes, 1 Push 1 ADJ and 2Hz fast forward. Additionally, it has a brightness adjustment function for the fluorescent display tube, providing four levels of brightness settings. FEATURES - - - - - - 12-hour system Wide power supply range from 4 to 18V (built-in voltage regulator circuit) Designed for 1/2 duty fluorescent display tubes 4.194304MHz (crystal oscillation) Four levels of brightness settings Package: 32-pin plastic SSOP (SSOP32-P-430-1.00-K) (ML9298MB) 1/12 FEDL9298-01 OKI Semiconductor BLOCK DIAGRAM Logic circuits VDDIN Power-on reset circuit RESET XT Grid driver XT DIM1 DIM2 Frequency divide circuit Grid decoder GR1 GR2 F64HZ 2a, 2d Time adjustment Second counter 4b, 4c, 2b Minute counter Segment decoder Segment driver Hour counter 2f 2c, col 2e 2g 3d, 1d 3e, 1e 3c, 1c 3g, 1g RESET COLSEL 3f, 1f 3b, 1b 3a, 1a TEST VDDOUT 3V regulator VCC High voltage circuit MS HS ZA BLANK A/C 2/12 FEDL9298-01 OKI Semiconductor PIN CONFIGURATION (TOP VIEW) VCC VDDOUT VDDIN TEST DIM1 DIM2 BLANK HS MS ZA A/C XT XT (NC) F64HZ GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 32 GR2 31 GR1 30 2a, 2d 29 4b, 4c, 2b 28 2f 27 2c, col 26 2e 25 2g 24 3d, 1d 23 3e, 1e 22 3c, 1c 21 3g, 1g 20 3f, 1f 19 3b, 1b 18 3a, 1a 17 COLSEL 3/12 FEDL9298-01 OKI Semiconductor PIN DESCRIPTION Pin DIM1 DIM2 A/C ZA HS MS BLANK COLSEL XT XT TEST F64Hz GR1 GR2 1a, 3a to 2b, 4b, 4c VCC GND VDDOUT VDDIN NC I/O I I I I I I I I I O I O O O   O I  Pull-up/ Pull-down Pull-down Pull-down Pull-up Pull-up Pull-up Pull-up Pull-down   Pull-up         Description Brightness switching pin. Input pin with a pull-up resistor to reset the circuits inside this LSI at a “L” level....