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ISP1106

Advanced USB transceivers

Ericsson  

ISP1105/1106

Advanced USB transceivers

7.4 Power supply input options

The ISP1105/1106 range has two power supply input options.

Internal regulator — VCC(5.0) is connected to 4.0 V to 5.5 V. The internal regulator is

used to supply the internal circuitry with 3.3 V (nominal). The Vreg(3.3) pin becomes a 3.3 V

output reference.

Regulator bypass — VCC(5.0) and Vreg(3.3) are connected to the same supply. The internal

regulator is bypassed and the internal circuitry is supplied directly from the Vreg(3.3) power

supply. The voltage range is 3.0 V to 3.6 V to comply with the USB specification.

The supply voltage range for each input option is specified in Table 10.

Table 10. Power supply input options

Input option

VCC(5.0)

Vreg(3.3)

VCC(I/O)

Internal regulator supply input for internal voltage reference output supply input for digital

regulator (4.0 V to 5.5 V) (3.3 V, 300 μA)

I/O pins (1.65 V to 3.6 V)

Regulator bypass

connected to Vreg(3.3)

with maximum voltage

drop of 0.3 V

(2.7 V to 3.6 V)

supply input

(3.0 V to 3.6 V)

supply input for digital

I/O pins (1.65 V to 3.6 V)

ISP1105_1106_10

Product data sheet

Rev. 10 — 28 September 2009

© ST-ERICSSON 2009. All rights reserved.

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