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LOUIS Datasheet PDF : 18 Pages
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ST5481
1 - GENERAL PURPOSE
The ST5481 is a single chip ISDN -BRI with USB
Interface low cost controller. The purpose is a low
cost ISDN modem for applications like INTERNET
ACCES and FAX capabilities when the PC is ON
(full operating mode). The bonus is to offer an
easy and lowcost access to INTERNET at a rate
of 128kbits/sec. EASY access due to plug and
play features via USB bus and lowcost due to host
processing concept and remote powering via USB
bus features.
2 - MAIN FUNCTIONS
The device controls the S0 ISDN basic rate
access (ITU normalization I430) and manages the
B1, B2, D channels through the USB bus. B1, B2,
D channels data flow is regulated through FIFO
memories of respectively 32, 32, 16 bytes in each
direction. On D, B1, B2 channels, all upper
protocols than basic HDLC framing protocol
are host processed from upper-datalink protocol
(I440 normalization), network protocol up to
applications drivers. Link Activation, deactivation
protocols (I430) is managed by the device. But the
full handling of the command and indicate
primitives is done by the host processor
accessing to dedicated registers. Call setup
signalling frames through D channel are managed
by the host processor.
Internal regulators can be enabled to feed the
device (and external devices) via the GNDBUS,
VBUS USB powering lines. They convert the USB
5 volts to 3.3 volts.
The device respects the USB release 1.0 power
management recommendations. When entered in
suspend mode on USB side the device drop into a
low power mode. An internal oscillator and a PLL
provide from an external 15.36MHz crystal a
48MHz clock for USB data rate recovering and
15.36MHz clock for S interface.
The device offers one operating mode called
CLOSED mode plus several test modes. In
CLOSED MODE the device presents the USB
interface, the S interface and 8 GPIO pins.
3 - PIN-OUT
Figure 1 : Pin-out Synoptic
LIP
LIN
IREF
LON
LOP
TEST13
TEST12
NCS_TEST11
SDI_TEST10
CFG1_TEST9
SDO_TEST8
SCK_TEST7
12 11 10 9 8 7 6 5 4 3 2 1
13
48
14
47
15
46
16
45
17
44
18
43
ST5481
19
42
20
41
21
40
22
39
23
38
24
37
25 26 27 28 29 30 31 32 33 34 35 36
GPIO7
GPIO6
GPIO5
GPIO4
GNDD1
GPIO3
GPIO2
GPIO1
GPIO0
XTALIN
XTALOUT
FLTPLL
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