ST7554 Просмотр технического описания (PDF) - STMicroelectronics
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ST7554 Datasheet PDF : 11 Pages
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ST7554
PIN LIST
Name
Pin
Type
Description
XTALIN
9
I Crystal Input
XTALOUT
10
O Crystal Output
RESET
12
I Reset Function to initialise the device (active low)
VBUS
5
GNDBUS
3
VREGA
6
VREGD
4
PSM
8
D+
2
D-
1
TRxD
35
DC
36
BUZEN
37
PULSE
38
I Positive Voltage Regulator Input, connected to USB VBUS
I Regulator Ground, connected to USB Ground (0V) (see Note 1)
I/O Positive Regulated Analog Input/Output Power Supply
I/O Positive Regulated Digital Input/Output Power Supply
I Power Supply Mode (Bus-powered or Self-powered)
I/O Positive Data Signal of Differential Data Bus conforming to USB Standard
Specification 1.0
I/O Negative Data Signal of Differential Data Bus conforming to USB Standard
Specification 1.0
I/O Transmit/Receive Data Led
I/O DC mask
I/O Buzzer Amplifier Enable/Mute
I/O Pulse dialing
DISHS
39
I/O Disconnect external phone
RFC
40
I/O Refresh
LED
41
I/O LED control
CD
42
I/O Carrier Detect Led
CLID
43
I/O Caller ID
HO
45
I/O Hook Control
HSDT
46
I/O Current sense
RI
48
I/O Ring Indicator
HC1
27
O Modem Codec Hardware Control mode selection
PDOWN
26
O SSI Powerdown bit output (active low)
MCLK
29
O SSI Master Clock Output
DAASEL
34
I Select Silicon or Discrete DAA Configuration Mode
FS
28
I SSI Frame Synchronisation Input
DOUT
31
DIN
30
FLTPLL
11
DGND
AGND
RESERVED
RESERVED
32
7
13 to 25-33-44
47
O SSI Serial Data Output
I SSI Serial Data Input
OA PLL filter analog output. Must be connected to analog ground AGND with
33pF capacitor
I Digital Ground (0V) (see Note 1)
I Analog Ground (0V) (see Note 1)
- Not connected
- Connect to digital ground DGND
Note 1 : Analog and digital ground pins must be tied together to USB ground GNDBUS.
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