BBK DK1010S, Руководство по обслуживанию, Страница: 28 / 31

15 LDQM Data I/O shielding signal
16 WE Write control signal
17 CAS Column address gate signal
18 RAS Row address gate signal
19 CS
Chip selection signal
20 SD-BS0
Section address 0 gate signal
21 SD-BS1 Section address 1 gate signal
22~26
、
29~35 MA[0~11] 12-byte address bus
36
、
40 NC Neutral pin
37 CKE Clock enabling signal
38 CLK System clock input
39 UDQM Data I/O shielding signal
V. Pin Functions of TAS5508
TAS5508 is a high performance audio signal processing IC provided by TI. It has 8-channel PWM
processing function, perfect protective functions, low distortion degree and excellent dynamic
characteristics.
1 VRA_PLL Provide 1.8V reference voltage for PLL
2 PLL_FLT_RET PLL external filtering circuit
3 PLL_FLTM PLL inverted input pin
4 PLL_FLTP PLL non-inverted output pin
5 AVSS Analog grounding
6 AVSS Analog grounding
7 VRD_PLL Provide 1.8V reference voltage for PLL
8 AVSS_PLL PLL analog grounding
9 AVDD_PLL PLL provides 3.3V voltage
10 VBGAP Provide 1.2 V reference voltage
11 RESET System reset signal, valid in low level
12 HP_SEL Microphone input/output selection
13 PDN Switch-off voltage, valid in low level
14 MUTE Software muting control, valid in low
level
15 DVDD 3.3V digital power supply
16 DVSS Digital grounding pin
17 VR_DPLL Provide 1.8V reference voltage for PLL
18 OSC_CAP Oscillation capacitance
19 XTL_OUT Crystal oscillation output pin
20 XTL_IN Crystal oscillation input pin
21 RESERVED Connect to digital grounding
22 TBASE_SEL Connect to digital grounding