Datasheet

MAX3301E/MAX3302E
USB On-the-Go Transceivers and Charge Pumps
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BIT NUMBER SYMBOL CONTENTS
VALUE AT
POWER-UP
0 int_sdwn
S et to 0 for nor m al op er ati on. S et to 1 to enter i nter r up t shutd ow n m od e. The I
2
C
i nter face and i nter r up t sour ces r em ai n acti ve, w hi l e al l other ci r cui tr y i s off.
0
1 spd_susp_ctl
S et to 0 to contr ol the M AX 3301E /M AX3302E b ehavi or w i th S P D and S U S . S et to 1 to
contr ol the M AX 3301E /M AX 3302E b ehavior w i th the sp eed and susp end b i ts i n contr ol
r eg i ster 1 (see Tab l e 7) .
0
2 bi_di
Set to 0 to transfer data from DAT_VP and SE0_VM to D+ and D-, respectively.
DAT_VP and SE0_VM are always inputs when this bit is 0. Set to 1 to control the
direction of data transfer with OE/INT.
1
3 dminus_dir
Set to 0 to transfer data from SE0_VM to D-. Set to 1 to transfer data from D- to
SE0_VM. Ensure that gp_en = 1, dat_se0 = 1, uart_en = 0, and OE/INT = low to
activate this function.
0
4 dplus_dir
Set to 0 to transfer data from DAT_VP to D+. Set to 1 to transfer data from D+ to
DAT_VP. Ensure that gp_en = 1, dat_se0 = 1, uart_en = 0, and OE/INT = low to
activate this function.
0
5 int_source
Set to 0 to use cr_int as the interrupt source for bit 7 of the interrupt source
register. Set to 1 to use sess_end as the interrupt source for bit 7 of the interrupt
source register (see Table 10).
0
6 sess_end
Session end comparator status (read only). Sess_end = 0 when V
BUS
>
sess_end threshold. Sess_end = 1 when V
BUS
< sess_end threshold.
—
7 gp_en
Set to 0 to disable general-purpose buffer mode. Set to 1 to enable general-
purpose buffer mode.
0
Table 14. Special-Function Register 1 (Write to Address 12h to Set, Write to Address 13h
to Clear)
BIT NUMBER SYMBOL CONTENTS
VALUE AT
POWER-UP
0 sdwn
Set to 0 for normal operation. Set to 1 to enable shutdown mode. Only the I
2
C
interface remains active in shutdown.
1
1 irq_mode
Set to 0 to set INT and OE/INT as open-drain outputs. Set to 1 to set INT and
OE/INT as push-pull outputs.
0
2 xcvr_input_disc
S et to 0 to l eave the D + /D - si ng l e- end ed r ecei ver i np uts connected . S et to 1 to
d i sconnect the D + /D - r ecei ver i np uts to r ed uce p ow er consum p ti on i n aud i o m od e.
0
3 reg_sel Set to 0 to power TRM from V
CC
. Set to 1 to power TRM from V
BUS
.0
4–7 — Reserved. Set to 0 for normal operation. 0000
Table 15. MAX3301E Special-Function Register 2 (Write to Address 16h to Set, Write to
Address 17h to Clear)
ation, suspend mode, interrupt shutdown, and shut-
down. For the ESD structures to work correctly, connect
a 1µF or greater capacitor from TRM to GND and from
V
BUS
to GND. ESD protection can be tested in various
ways; the D+, D-, ID_IN, and V
BUS
inputs/outputs are
characterized for protection to the following limits:
• ±15kV using the Human Body Model
• ±6kV using the IEC 61000-4-2 Contact Discharge
Method
• ±10kV using the IEC 61000-4-2 Air-Gap Discharge
Method
Note: sess_end value at power-up is dependent on the voltage at V
BUS
.