ISP1105 데이터 시트보기 (PDF) - Ericsson

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ISP1105

Advanced USB transceivers

Ericsson  

ISP1105/1106

Advanced USB transceivers

7.3 Power supply configurations

The ISP1105/1106 can be used with different power supply configurations, which can be

changed dynamically. An overview is given in Table 9.

Normal mode — Both VCC(I/O) and VCC(5.0) or (VCC(5.0) and Vreg(3.3)) are connected. For

5 V operation, VCC(5.0) is connected to a 5 V source (4.0 V to 5.5 V). The internal voltage

regulator then produces 3.3 V for the USB connections. For 3.3 V operation, both VCC(5.0)

and Vreg(3.3) are connected to a 3.3 V source (3.0 V to 3.6 V). VCC(I/O) is independently

connected to a voltage source (1.65 V to 3.6 V), depending on the supply voltage of the

external circuit.

Disable mode — VCC(I/O) is not connected, VCC(5.0) or (VCC(5.0) and Vreg(3.3)) are

connected. In this mode, the internal circuits of the ISP1105/1106 ensure that the (D+, D−)

pins are in three-state and the power consumption drops to the low-power (suspended)

state level. Some hysteresis is built into the detection of VCC(I/O) lost.

Sharing mode — VCC(I/O) is connected, (VCC(5.0) and Vreg(3.3)) are not connected. In this

mode, the (D+, D−) pins are made three-state and the ISP1105/1106 allows external

signals of up to 3.6 V to share the (D+, D−) lines. The internal circuits of the ISP1105/1106

ensure that virtually no current (maximum 10 μA) is drawn via the (D+, D−) lines. The

power consumption through pin VCC(I/O) drops to the low-power (suspended) state level.

Both the VP and VM pins are driven HIGH to indicate this mode. Pin RCV is made LOW.

Some hysteresis is built into the detection of Vreg(3.3) lost.

Table 8. Pin states in disable or sharing mode

Pins

Disable mode state

VCC(5.0) / Vreg(3.3)

5 V input / 3.3 V output;

3.3 V input / 3.3 V input

VCC(I/O)

Vpu(3.3)

(D+, D−)

not present

high impedance (off)

high impedance

(VP, VM)

invalid[1]

RCV

invalid[1]

Inputs (VO/VPO, FSE0/VMO, SPEED, high impedance

MODE[2], SUSPND, OE, SOFTCON)

Sharing mode state

not present

1.65 V to 3.6 V input

high impedance (off)

high impedance

H

L

high impedance

[1] High impedance or driven LOW.

[2] ISP1105 only.

Table 9. Power supply configuration overview

VCC(5.0) or Vreg(3.3) VCC(I/O)

Connected

connected

Configuration

normal mode

Connected

not connected

disable mode

Not connected

connected

sharing mode

[1] High impedance or driven LOW.

Special characteristics

-

(D+, D−) and Vpu(3.3) high

impedance; VP, VM, RCV:

invalid[1]

(D+, D−) and Vpu(3.3) high

impedance;

VP, VM driven HIGH; RCV driven

LOW

ISP1105_1106_10

Product data sheet

Rev. 10 — 28 September 2009

© ST-ERICSSON 2009. All rights reserved.

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