tc94b06wbg TOSHIBA Semiconductor CORPORATION, tc94b06wbg Datasheet - Page 5

• Manufacturer Part Number: tc94b06wbg
• Description: Stereo Headphone Amplifier With Electronic Volume
• Manufacturer: TOSHIBA Semiconductor CORPORATION

2. Over current protection circuit.
This IC built in the over current detection type of protection circuit.
The flow chart of the protection circuit is the following.
1-3. Volume table
Mute[7:6], Volume[5:0]
Gain control
0000 000x
0000 001x
0000 010x
0000 100x
0000 101x
0001 000x
0001 001x
0001 010x
0001 100x
0001 101x
10xx xxxx
01xx xxxx
0000 011x
0000 110x
0000 111x
0001 011x
0001 110x
(Note) Over current bit is reset Reg 1 is read by I2C-bus.
Figure 1 : Flow of over current protection circuit
Set “Over current” bit of Reg 1to “1”
Mute_Lch
Mute_Rch
Gain
Reset output mute
[dB]
Normal operation
-59
-55
-51
-47
-43
-39
-35
-31
-27
-25
-23
-21
-19
-17
-15
Set output mute
Output current
Wait 7ms
Check
(Note)
Over current
5
Mute[7:6], Volume[5:0]
Gain control
Normal
0010 000x
0010 001x
0010 010x
0010 100x
0010 101x
0001 111x
0010 011x
0010 110x
0010 111x
0011 000x
0011 001x
0011 010x
0011 011x
0011 100x
0011 101x
0011 110x
0011 111x
TC94B06WBG
Gain
[dB]
-13
-10
-11
+1
+2
+3
+4
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
2011-04-18