ST5481 Просмотр технического описания (PDF) - STMicroelectronics
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ST5481 Datasheet PDF : 18 Pages
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ST5481
The host gets back the configuration of the device
either a low power device, either a high power
device (max power parameter higher than
100mA). Being a high power device allows to set
on a wake up ability because looking for a line
signal detection consume more than 500uA
allowed for a low power device when in a suspend
state.
To adjust the maximum power consumption
parameter into the configuration descriptor, the
logical values present on pins CFG0, CFG1,
RPSM are used (see Table 1).
At power on, the digital regulator is immediately
ON and after 100µs the analog regulator is
authorized to feed the internal oscillator.
– Initialization and clocks management.
– A HARDWARE PIN RESET is done through pin
NRESET (active low).
– A delay of 4.5ms is introduced before distribut-
ing the clocks to the internal functions.
– A USB HARDWARE RESET is done through
DP, DM pins. This reset affects the USB inter-
face, resetting the USB core state machines. It
does not affect the application (S interface, reg-
isters, fifos).
A USB SOFTWARE RESET is done through USB
bmRequest SET_DEFAULT. It brings the S
interface, application registers, application state
machines and fifos pointers to default state.
When the device goes out of SUSPEND_CLOCK
state, a delay of 4.5ms is introduced before
distributing the clocks to the internal functions.
When the device enters into a suspend mode due
to inactivity on USB bus, the oscillator is stopped
in order to save power except if FCONF(3) is
equal to 1.
Table 1 : Maximum Power Current and Wake up Ability Coding
Max Power High/Low
Current
Power
Wake Up
Ability
CFG1
CFG0
RPSM
100 mA
LO
NO
0
0
1
150 mA
HI
NO
0
1
1
150 mA
HI
YES
1
0
1
250 mA
HI
YES
1
1
1
100 mA
LO
NO
0
0
0
150 mA
HI
NO
0
1
0
150 mA
HI
YES
1
0
0
250 mA
HI
YES
1
1
0
Bm Attributes Max Power
ROM add 27 ROM add 28
80
32
80
96
A0
96
A0
F9
C0
32
C0
96
E0
96
E0
F9
8/18
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