ISP1109BS Просмотр технического описания (PDF) - Philips Electronics

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ISP1109BS

Universal Serial Bus transceiver with carkit support

Philips Electronics 

Philips Semiconductors

ISP1109

USB transceiver with carkit support

• If the Power-down is because of the setting of register bit PWR_DN in the Mode

Control register, the bias will be enabled if the VBUS voltage goes above the

SESS_VLD threshold. Note: In this case, make sure bit SESS_VLD_IEH in the

Interrupt Enable High register is set to logic 1 before the PWR_DN bit is set. The

recommended sequences for software is:

a. Set bit SESS_VLD_IEH to logic 1

b. Set bit PWR_DN to logic 1

c. Wait for interrupt from the ISP1109

d. If INT_N is asserted, read the Interrupt Latch register

e. If bit SESS_VLD_INT is logic 1, clear bit PWR_DN (Note: Software must clear

bit PWR_DN within 5 ms from the time pin INT_N is asserted. For details,

see Section 10).

Pin ISET will remain LOW when VCC is below Vth(ISET). Pin ISET can also be controlled by

software through register bits. If bit ISET_DRV_EN is set to logic 1, the status of the ISET

pin will be determined by bit ISET_STATE.

7.9 USB transceiver

7.9.1 Differential driver

The operation of the driver is described in Table 6.

Table 6: Transceiver driver operating setting

Pin

RESET_N [1] OE_N

Pin or bit

SUSPEND

Bit DAT_SE0

HIGH

LOW 0

0

HIGH

LOW 0

1

HIGH

LOW 1

X

HIGH

HIGH X

X

LOW

X

X

X

[1] Include the internal power-on-reset pulse (active HIGH).

Differential driver

output value from DAT/VP to DP and

SE0/VM to DM

output value from DAT/VP to DP and

DM, if SE0/VM is LOW; otherwise,

drive both DP and DM LOW

output value from DAT/VP to DP and

DM

high-Z

high-Z

Table 7 shows the behavior of the transmit operation in detail.

Table 7: USB functional mode: transmit operation

USB mode

Inputs

DAT/VP

SE0/VM

DAT_SE0

LOW

LOW

DAT_SE0

HIGH

LOW

DAT_SE0

LOW

HIGH

DAT_SE0

HIGH

HIGH

VP_VM

LOW

LOW

Outputs

DP

LOW

HIGH

LOW

LOW

LOW

DM

HIGH

LOW

LOW

LOW

LOW

9397 750 13355

Product data sheet

Rev. 01 — 14 July 2005

© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

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