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CM108B USB Audio Single C hip Datasheet Revision: 1.11 www .cmedia.com.tw P age 19 / 24 Copyright© C -Media Electr onics Inc. Bits Read/Write Description Default 7-0 R / W When HID_ OR0[7:6] = = 2’b00: HID_ OR2[3:0] i s …
CM108B
USB Audio Single Chip
Datasheet Revision: 1.11 www.cmedia.com.tw
Page 18 / 24 Copyright© C-Media Electronics Inc.
1: volume-down button pressed
0
R
0: volume-up button released
1: volume-up button pressed
0x0
HID_IR1 (HID input report byte 1)
Offset: 0x01
Bits
Read/Write
Description
Default
7-0
R
When HID_IR0[7:6] == 2’b00: HID_IR1[3:0] is the input from
GPIO4 ~ GPIO1 in input mode
When HID_OR0[7] == 1’b1: mapped from EEPROM_DATA0
0x00
HID_IR2 (HID input report byte 2)
Offset: 0x02
Bits
Read/Write
Description
Default
7-0
R
When HID_OR0[7] == 1’b1: mapped from EEPROM_DATA1
0x00
HID_IR3 (HID input report byte 3)
Offset: 0x03
Bits
Read/Write
Description
Default
7-0
R
When HID_OR0[7] == 1’b1: mapped from EEPROM_CTRL
0x00
HID_OR0 (HID output report byte 0)
Offset: 0x04
Bits
Read/Write
Description
Default
7-6
R / W
0: HID_OR1-2 are used for GPO; HID_OR0, 3 are used for SPDIF
1: reserved
2: values written to HID_OR0-3 are also mapped to
EEPROM_DATA0-1, EEPROM_CTRL (See Note)
3: reserved
0x0
5
R / W
Reserved
0x0
4
R / W
When HID_OR0[7] == 1’b0: valid bit in SPDIF frame
When HID_OR0[7] == 1’b1: reserved
0x0
3-0
R / W
When HID_OR0[7] == 1’b0: first nibble of SPDIF status channel
When HID_OR0[7] == 1’b1: reserved
0x0
Note 1: When EEPROM access is done, HID interrupt will occur. USB host can get the result from interrupt pipe
(endpoint 3).
Note 2: HID_OR0 is used for SPDIF when SPDIF_CONFIG[5] == 1’b0
HID_OR1 (HID output report byte 1)
Offset: 0x05
Bits
Read/Write
Description
Default
7-0
R / W
When HID_OR0[7:6] == 2’b00: HID_OR1[3:0] is the output to
GPIO4 ~ GPIO1 in output mode
0: GPO drives L
1: GPO drives H
When HID_OR0[7:6] == 2’b01: reserved
When HID_OR0[7:6] == 2’b1x: mapped to EEPROM__DATA0
0x00
HID_OR2 (HID output report byte 2)
Offset: 0x06
CM108B
USB Audio Single Chip
Datasheet Revision: 1.11 www.cmedia.com.tw
Page 19 / 24 Copyright© C-Media Electronics Inc.
Bits
Read/Write
Description
Default
7-0
R / W
When HID_OR0[7:6] == 2’b00: HID_OR2[3:0] is the mode setting
for GPIO4 ~ GPIO1
0: set GPIO to input mode
1: set GPIO to output mode
When HID_OR0[7:6] == 2’b01: reserved
When HID_OR0[7:6] == 2’b1x: mapped to EEPROM_DATA1
0x00
HID_OR3 (HID output report byte 3)
Offset: 0x07
Bits
Read/Write
Description
Default
7-0
R / W
When HID_OR0[7] == 1’b0: category byte of SPDIF status
channel
When HID_OR0[7] == 1’b1: mapped to EEPROM_CTRL
0x00
Note: HID_OR3 is used for SPDIF when SPDIF_CONFIG[5] == 1’b0
CM108B
USB Audio Single Chip
Datasheet Revision: 1.11 www.cmedia.com.tw
Page 20 / 24 Copyright© C-Media Electronics Inc.
8 Electrical characteristics
8.1 Absolute maximum rating
Symbol
Parameters
Value
Unit
Dvmin
Min. digital supply voltage
– 0.3
V
Dvmax
Max. digital supply voltage
+ 6
V
Avmin
Min. analog supply voltage
– 0.3
V
Avmax
Max. analog supply voltage
+ 6
V
Dvinout
Voltage on any digital input or output pin
–0.3 to +5.5
V
Avinout
Voltage on any analog input or output pin
–0.3 to +3.96
V
TBstgB
Storage temperature range
-40 to +125
°C
ESD (HBM)
ESD human body mode
+-4000
V
ESD (MM)
ESD machine mode
+-200
V
Latch Up
JEDEC standard no.78, Mar. 1997
200
mA
8.2 Operation conditions
Operation conditions
Min
Typ
Max
Unit
Analog supply voltage
4.5
5.0
5.5
V
Digital supply voltage
4.5
5.0
5.5
V
Total power consumption
-
37.25
mA
Suspend-mode power consumption
-
1.58
uA
Operating ambient temperature
-20
-
70
°C
8.3 Electrical parameters
Min.
Typ.
Max.
Unit
DAC (10K Ohm Loading)
Resolution
-
16
-
Bits
THD + N (-3dBr) @1KHz
-
-72
-
dB
SNR
-
93
-
dB
Silent SNR
-
98
-
dB
Dynamic range
-
92
-
dB
Frequency response 48KHz
20
-
20K
Hz
Frequency response 44.1KHz
20
-
20K
Hz
Full Scale Output voltage (rms)
-
0.995
-
Vrms
DAC (32 Ohm loading)
Resolution
-
16
-
Bits
THD + N (-3dBr) @1KHz
-
-70
-
dB
SNR
-
93
-
dB
Silent SNR
-
98
-
dB
Dynamic range
-
92
-
dB
Frequency response 48KHz
20
-
20K
Hz
Frequency response 44.1KHz
20
-
20K
Full Scale Output voltage (rms)
-
0.442
-
Vrms
Output Volume Control
Volume Control Initial Value
-10
dB