m65881afp Renesas Electronics Corporation., m65881afp Datasheet - Page 13

• Manufacturer Part Number: m65881afp
• Description: Digital Amplifier Processor S-master Technology
• Manufacturer: Renesas Electronics Corporation.

SERIAL CONTROL
M65881AFP
Rev.1.00 2003.05.08
1. Gain Control Mode
bit
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
1
2
3
4
5
6
7
8
9
•Output Limit (bit5,6: NSLMT1,2)
•Limit value setting of output for gain control and
•Channel selection for Gain Control Block (bit7,bit8: GCONT1, GCONT2)
•PWM Duty 50% Mute (bit9,10:NSPMUTEL,R)
NSPMUTER
NSPMUTEL
NSLMT1,2
NSLMT1,2
The M65881AFP has Over Flow Limit function which detects by input signal level and limit gain control.
The limit Value is set by Gain control Mode ( bit5,6 "NSLMT1, 2") and System2 Mode( bit17 "NSOBIT").
Table 1-1a Limit Value [ In case of 6bit mode, system2 mode bit 17( NSOBIT )="L".]
These bit selection enable to control gain data "L/R common" or "L/R independence".
Bit8 is enable only the case of " Bit7="H".
These bit set "Duty 50% fixed Mute" with Lch/Rch independence.
NSPMUTEL : "L"….Mute release,
NSPMUTER : "L"….Mute release,
Flag name
Table 1-1b Limit Value [ In case of 5bit mode, system2 mode bit 17( NSOBIT )="H".]
GCONT1
GCONT2
NSLMT1
NSLMT2
* Duty 50 % Mute Operation are operated by one of the following setting.
MODE1
MODE2
GAIN10
GAIN11
GAIN12
TEST1
TEST2
(H, H)
(H, H)
(H, L)
(L, H)
(H, L)
(L, H)
(L, L)
(L, L)
GAIN0
GAIN1
GAIN2
GAIN3
GAIN4
GAIN5
GAIN6
GAIN7
GAIN8
GAIN9
GCONT1:"L"… L/R common "H"...L/Rch independence.
GCONT2:"L"… Rch only
• Gain control bit9,10 ( NSPMUTEL,R)
• NSPMUTE pin
• Serial control system2 mode ,bit 14 (NSPMUTE)
Mode setting1
Mode setting2
Test Mode 1
Test Mode 2
Output Limit 1
Output Limit 2
Channel selection for Gain Control Block 1
Channel selection for Gain Control Block 2
Lch Duty 50% Mute for PWM Output
Rch Duty 50% Mute for PWM Output
Gain Data Index (MSB)
Gain Data Index
Gain Data Index
Gain Data Index
Gain Data Index (LSB)
Gain Data Mantissa (MSB)
Gain Data Mantissa
Gain Data Mantissa
Gain Data Mantissa
Gain Data Mantissa
Gain Data Mantissa
Gain Data Mantissa
Gain Data Mantissa (LSB)
page 13 of 23
Output Limit Value of gain
Output Limit Value of gain
Functional Explanation
±0.90625
±0.84375
±0.90625
±0.84375
±0.8125
±0.9375
±0.875
±0.875
"H"…Lch only
"H"…Lch Mute
"H"…Rch Mute
(bit5, 6 : NSLMT1, 2)
L/R Independence
PWM Output ( Limit Value from
PWM Output (Limit Value from
active
active
Lch
H
Refer to Table 1-1.
*Enable both output for Power and Headphone.
63 values (±31)
61 values (±30)
59 values (±29)
57 values (±28)
31 value (±15)
31 value (±15)
29 value (±14)
29 value (±14)
No setting bits means " Don't care".
L/R Common
non-active
non-active
"L" fixed
"L" fixed
"L" fixed
"L" fixed
Rch
L
Block)
Block)
INIT
H
H
–
–
L
L
L
L
L
L
L
L
–
L
L
L
L
L
L
L
L
L
L
L