DOWNLOAD Panasonic KX-MB2051RUB / KX-MB2061RUB Service Manual ↓ Size: 22.44 MB | Pages: 127 in PDF or view online for FREE

29

KX-MB2051RUB / KX-MB2061RUB

65

*BE0

O

+3.0V

Byte Enable signal (NOT USED)

66

SCL2/P30

O

+3.0V

EEPROM INTERFACE SIGNAL (SCL2)

67

SDA2

IO

+3.0V

EEPROM INTERFACE SIGNAL 

68

DAB0

IO

+3.0V

Flash/Mask ROM Data [0]

69

DAB8

IO

+3.0V

Flash/Mask ROM Data [8]

70

DAB1

IO

+3.0V

Flash/Mask ROM Data [1]

71

DAB9

IO

+3.0V

Flash/Mask ROM Data [9]

72

DAB2

IO

+3.0V

Flash/Mask ROM Data [2]

73

DAB10

IO

+3.0V

Flash/Mask ROM Data [10]

74

DAB3

IO

+3.0V

Flash/Mask ROM Data [3]

75

DAB11

IO

+3.0V

Flash/Mask ROM Data [11]

76

VSS4

-

GND

GND

77

VDD2

-

+1.8V

+1.8V

78

VDDIO3

-

+3.0V

+3.0V

79

P20/PWM0/SPIDI

I

+3.0V

SPI SERIAL INTERFACE (SPIDI)

80

P21/PWM1/SPICLK

O

+3.0V

SPI SERIAL INTERFACE (SPICLK)

81

P22/ADC0/CLK100

I

+1.8V

CIRCUIT CONTROL INPUT PORT (ALC)

82

P23/ADC1

I

+3.0V

NOT USED

83

P24/SCL1

O

+3.0V

CIRCUIT CONTROL OUTPUT PORT (LIN-
ERLY)

84

P25/SDA1

I

+3.0V

CIRCUIT CONTROL INPUT PORT (CPC)

85

DAB4

IO

+3.0V

Flash/Mask ROM Data [4]

86

DAB12

IO

+3.0V

Flash/Mask ROM Data [12]

87

DAB5

IO

+3.0V

Flash/Mask ROM Data [5]

88

DAB13

IO

+3.0V

Flash/Mask ROM Data [13]

89

DAB6

IO

+3.0V

Flash/Mask ROM Data [6]

90

DAB14

IO

+3.0V

Flash/Mask ROM Data [14]

91

DAB7

IO

+3.0V

Flash/Mask ROM Data [7]

92

DAB15

IO

+3.0V

Flash/Mask ROM Data [15]

93

TM

I

+3.0V

NOT USED

94

P27/SPIDO

O

+3.0V

SPI SERIAL INTERFACE (SPIDO)

95

P16/PON/INT6

I

+1.8V

POWER ON SIGNAL

96

P17/CHARGE/INT7

O

+3.0V

NOT USED

97

P26/stop_charge

O

+3.0V

NOT USED

98

RINGING

I

+3.0V

NOT USED

99

LINEREF

O

+1.8V

CID REFERENCE VOLTAGE OUTPUT

100

LINEOUT

O

+1.8V

CIRCUIT OUTPUT

101

LINE_IN+

I

+1.8V

CID SIGNAL INPUT

102

LINE_IN-

I

+1.8V

CIRCUIT INPUT

103

LDO1_sense

I

+3.0V

+3.0V POWER CONTROL SIGNAL

104

LDO1_CTRL

O

+3.0V

+3.0V POWER CONTROL SIGNAL

105

LDO2_CTRL

O

+3.0V

+1.8V POWER CONTROL SIGNAL

106

VBAT2

I

+3.3V

NOT USED

107

CIDIN+

I

+1.8V

NOT USED

108

AVS2

-

GND

GND

109

AVD2

-

+1.8V

+1.8V

110

LSR+/REF

O

+1.8V

SPEAKER/HANDSET SPEAKER OUTPUT (+)

111

LSR-/REF

O

+1.8V

HANDSET SPEAKER OUTPUT (-)

112

CIDIN-

I

+1.8V

NOT USED

113

CIDOUT

O

+1.8V

NOT USED

114

MIC-

I

+1.8V

NOT USED

115

VREF-

O

GND

NOT USED

116

VBUF

O

GND

NOT USED

117

AGND

-

GND

GND

118

MIC+

I

+1.8V

HANDSET MIC INPUT

119

VREF+

O

+1.8V

NOT USED

120

*RST

I

+1.8V

BBIC SYSTEM RESET

121

AD0

O

+3.0V

Flash/Mask ROM Address [0]

122

AD1

O

+3.0V

Flash/Mask ROM Address [1]

123

AD2

O

+3.0V

Flash/Mask ROM Address [2]

124

AD3

O

+3.0V

Flash/Mask ROM Address [3]

125

AD4

O

+3.0V

Flash/Mask ROM Address [4]

126

AD5

O

+3.0V

Flash/Mask ROM Address [5]

127

AD6

O

+3.0V

Flash/Mask ROM Address [6]

128

AD7

O

+3.0V

Flash/Mask ROM Address [7]

PIN NO.

PinName

I/O

POWER SUPPLY VOLTAGE

EXPLANATION

30

KX-MB2051RUB / KX-MB2061RUB

1. Function

This unit has a lithium battery (BAT300) which works for the Real Time Clock IC (RTC: inside IC300).
The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.

2. RTC Inside (IC300) Backup Circuit Operation

When the power switch is turned ON, power is supplied to the RTC (inside IC300). At this time, the voltage at pin AF3 of the
IC300 is +3.3V. When the power switch is turned OFF, the BAT300 supplies power to RTC through DA300. 
When the power switch is OFF and the voltage of +3.3V decreases, pin AF3 of RTC (IC300) becomes roughly the same volt-
age as the battery voltage. RTC goes into the backup mode, in which the power consumption is lower.

31

KX-MB2051RUB / KX-MB2061RUB

The modem (Included IC300) has all the hardware satisfying the CCITT standards mentioned previously.
ALL processing is controlled by the SOC (IC300) according to CCITT procedures.
This modem (Included IC300) has an automatic application equalizer. With training signal 1 or 2 at the time of G3 reception, it can
automatically establish the optimum equalizer. 

The digital image data sent on ATXD line from modem (Included IC300).
AFE IC(IC200) and Analog DAA

*1

 circuit to the telephone line.

The analog image data which is received from the telephone line passes through Analog DAA circuit and enters AFE IC(IC200).
The signals are changed to digital data in AFE IC and IC300. In this case, the image signals from the telephone line are trans-
mitted serially. Here, the internal equalizer circuit reduces the image signals to a long-distance receiving level. This is designed
to correct the characteristics of the frequency band centered around 3 kHz and maintain a constant receiving sensitivity.

The path is the same as Facsimile Reception.

This is the call signal which is generated the BBIC (IC902) and sent to the speaker.

 DAA : Direct Access Arrangement

32

KX-MB2051RUB / KX-MB2061RUB

Composed of ITS circuit and NCU circuit.

The analog section works as an interface between the telephone line and controls ITS circuit and NCU circuit.
The analog section control signals are output from BBIC (IC902).

[NCU]: Network Control Unit the NCU comprises of the following; DC loop forming circuit to connect with the telephone line;
Switching circuit for other interconnected telephones; Bell detection circuit; Remote fax activation circuit.
Refer to NCU Section (P.41) for the details.