Philips CEM2000/00, Service Manual

Page: 31 / 72

PT7313E
V1.0 7 February 2010
DATA BYTES
MSB LSB Function
0 0 B2 B1 B0 A2 A1 A0 Master Volume
1 1 0 B1 B0 A2 A1 A0 Speaker ATT LR
1 1 1 B1 B0 A2 A1 A0 Speaker ATT RR
1 0 0 B1 B0 A2 A1 A0 Speaker ATT LF
1 0 1 B1 B0 A2 A1 A0 Speaker ATT RF
0 1 0 G1 G0 LD S1 S0 Input Switch and Gain
0 1 1 0 C3 C2 C1 C0 Bass Control
0 1 1 1 C3 C2 C1 C0 Treble Control
DATA RATE
The PT7313E support Standard-Mode (100kbit/s) I
2
C data rate In all operation condition, in specified condition it also
support Fast-Mode (400kbit/s) I
2
C data rate, please refer to the follow table:
MCU Level
PT7313E VDD Voltage
4V 5V 6V 7V 8V 9V 10V
2.5V F F x x x x x
3.3V F F F F S S x
5V x F F F F F F
Notes:
1. x = Not allow in this combination; S = Standard Mode Supported, F = Fast Mode Supported.
2. Data rate specification is design guarantee only, not fully tested in every combination.
I
2
C BUS INITIAL TIME
The PT7313E is controlled by the I
2
C bus command; each time the supply voltage applied to chip it needs an initial time
to reset all of the internal decoder register, in this period access the I
2
C bus is prohibited. The initial time is determinate
by capacitance it attached on REF pin (CREF) and Td. For proper operation USER must check the I
2
C starts timing is fit
this requirement and recommended Td timing shown on next page is 50mS.
VDD
VREF
I2C
90% VREF
I2C PROHIBIT Td
POWER ON
I2C STARTS
50mS
P rinceton Technology Corp
.
ANGUS ELECTRONICS CO., LTD
Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: www.angus.com.hk