ISP1183 Просмотр технического описания (PDF) - Philips Electronics

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ISP1183

Low-power Universal Serial Bus interface device with DMA

Philips Electronics 

Philips Semiconductors

ISP1183

Low-power USB interface device with DMA

Table 3: ISP1183 operation modes…continued

Pin name

Plug-out

state

Dead state Reset state

SUSPEND H

L[1]

L

VBUSDET_N H

L[1]

L[3]

DATA

Hi-Z

L[1]

Hi-Z

Plug-in state Normal state

L

L

H -> L[4]

L

Hi-Z

-

[1] Not driven LOW. There is, however, no current flow through the pads because no I/O supply voltage is

available. Therefore, no potential will develop at the output.

[2] During the normal operation, when VBUS is available, pin SUSPEND is LOW. If there is no activity on

the USB bus for 3 ms or more, a suspend interrupt is generated on pin INT_N. On receiving the

suspend interrupt, the external processor issues a GOSUSP command to the device. Once the

GOSUSP command is issued by the processor, the device starts to prepare itself to go to the suspend

mode. During suspend, to reduce power consumption, the internal clocks can be shut down. Once the

device is completely ready to go into the suspend mode, it will assert pin SUSPEND HIGH and go into

the suspend mode. The typical time between the issuing of the GOSUSP command to the device and

the device asserting pin SUSPEND HIGH is approximately 2 ms.

[3] Independent of the external reset. Depends only on the power-on reset.

[4] On connecting the USB cable (VBUS), pin VBUSDET_N will change from HIGH level to LOW level in

approximately 2.5 ms to 3.5 ms.

8.11 Power supply

The ISP1183 is powered from a single supply voltage, ranging from 4.0 V to 5.5 V. An

integrated voltage regulator provides a 3.3 V supply voltage for the internal logic and

the USB transceiver. This voltage is available at pin VREG(3V3) for connecting an

external pull-up resistor on USB connection pin DP. See Figure 3.

The ISP1183 can also be operated from a 3.0 V to 3.6 V supply, as shown in

Figure 4. In this case, the internal voltage regulator is disabled and pin VREG(3V3)

must be connected to VBUS. For details, see Section 19.

8

12

ISP1183 18

VBUS

4.0 V to 5.5 V

VREG(3V3)

VDD(I/O) 1.65 V to 3.6 V

VDD

21

VDD(I/O)

30

004aaa295

Fig 3. ISP1183 with a 4.0 V to 5.5 V supply.

VDD

21

8

ISP1183 12

VBUS

3.0 V to 3.6 V

VREG(3V3)

18 VDD(I/O)

30 VDD(I/O)

004aaa296

Fig 4. ISP1183 with a 3.0 V to 3.6 V supply.

8.12 Crystal oscillator

The ISP1183 has a crystal oscillator designed for a 6 MHz parallel-resonant crystal

(fundamental). A typical circuit is shown in Figure 5. Alternatively, an external clock

signal of 6 MHz can be applied to input XTAL1, while leaving output XTAL2 open.

9397 750 11804

Product data

Rev. 01 — 24 February 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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