name:         HT16512
function:     1/4 to 1/11 Duty VFD Controller
package:      QFP44,44
manufacturer: Holtek

+---------+-----------+-------------+----------+
|  1 - SW0| 12 - K2   | 23 - S8     | 34 - G3  |
|  2 - SW1| 13 - K3   | 24 - S9     | 35 - G2  |
|  3 - SW2| 14 - VDD  | 25 - S10    | 36 - G1  |
|  4 - SW3| 15 - S0/K0| 26 - S11/G10| 37 - G0  |
|  5 - DO | 16 - S1/K1| 27 - VEE    | 38 - VDD |
|  6 - DI | 17 - S2/K2| 28 - S12/G9 | 39 - LED3|
|  7 - VSS| 18 - S3/K3| 29 - S13/G8 | 40 - LED2|
|  8 - CLK| 19 - S4/K4| 30 - S14/G7 | 41 - LED1|
|  9 - CSB| 20 - S5/K5| 31 - S15/G6 | 42 - LED0|
| 10 - K0 | 21 - S6   | 32 - G5     | 43 - VSS |
| 11 - K1 | 22 - S7   | 33 - G4     | 44 - OSC |
+---------+-----------+-------------+----------+


This pinout came from the Chipdir:
http://www.chipdir.org/