Overview
A 9 button input i2c device (8 tactile, one slide switch).
I've lost the source code i used for this 
i2c Details
Addressing
| Address: | 0x24 (W: 0x48, R: 0x49) |
Write Commands
| 0x01 | Read switches |
Returns
Return #1
| 1 | 0 | S1 |
| 0 | 0 | B1 |
| 0 | 1 | B2 |
| 0 | 2 | B3 |
| 0 | 3 | B4 |
| 0 | 4 | B5 |
| 0 | 5 | B6 |
| 0 | 6 | B7 |
| 0 | 7 | B8 |
Pins
| 0 | Gnd |
| 0 | Vcc (3.3 - 5.0v) |
| 0 | i2c - SCL |
| 0 | i2c - SDA |
Example (BusPirate)
[0x48 0x01][0x49 rr]
Send read switches command 0x48 to i2c write address 0x48 Read 2 bytes from i2c read address 0x49