Rainbow-electronics MAX3301E Bedienungsanleitung PDF herunterladen (Seite 10)

MAX3301E

USB On-the-Go Transceiver and Charge Pump

10 ______________________________________________________________________________________

Pin Description (continued)

THIN QFN

UCSP

NAME FUNCTION

20 C3 ADD I

C-Interface Address Selection Input. (See Table 5.)

22 C4 ID_IN

ID Input. ID_IN is internally pulled up to V

. The state of ID_IN determines ID bits 3 and 5 of

the interrupt source register (see Table 10).

23 D5 D-

USB Differential Data Input/Output. Connect D- to the D- terminal of the USB connector

through a 27.4Ω ±1% series resistor.

24 E5 D+

USB Differential Data Input/Output. Connect D+ to the D+ terminal of the USB connector

through a 27.4Ω ±1% series resistor.

26 D4 VM

Single-Ended Receiver Output. VM functions as a receiver output in all operating modes. VM

duplicates D-.

27 E4 TRM

USB Transceiver Regulated Output Voltage. TRM provides a regulated 3.3V output. Bypass

TRM to GND with a 1µF ceramic capacitor installed as close to the device as possible. TRM

normally derives power from V

. TRM provides power to internal circuitry and provides the

pullup voltage for the internal USB pullup resistor. Do not use TRM to power external

circuitry. The reg_sel bit (bit 3 of special-function register 2, see Table 15) controls the TRM

power source with software.

30 D3 VP

Single-Ended Receiver Output. VP functions as a receiver output in all operating modes. VP

duplicates D+.

31 E2 V

BUS

USB Bus Power. Use V

BUS

as an output to power the USB bus, or as an input to power the

internal linear regulator. Bits 5 to 7 of control register 2 (see Table 8) control the charging

and discharging functions of V

BUS

32 E1 C+ Charge-Pump Flying-Capacitor Positive Terminal

EP — EP Exposed Paddle. Connect to GND or leave floating

Test Circuits and Timing Diagrams

DUT

27.4Ω 220Ω

TEST POINT

D+/D-

LOAD FOR DISABLE TIME (D+/D-) MEASUREMENT

V = 0 FOR t

PHZ

V = V

TRM

FOR t

PLZ

= 50pF FOR FULL SPEED,

= 200pF TO 600pF FOR LOW SPEED

Figure 1. Load for Disable Time Measurement

DUT

27.4Ω

15kΩ

TEST POINT

D+/D-

LOAD FOR

1) ENABLE TIME (D+/D-) MEASUREMENT

2) DAT_VP/SEO_VM TO D+/D- PROPAGATION DELAY

3) D+/D- RISE/FALL TIMES

= 50pF FOR FULL SPEED,

= 200pF TO 600pF FOR LOW SPEED

Figure 2. Load for Enable Time, Transmitter Propagation Delay,

and Transmitter Rise/Fall Times

DUT

TEST POINT

RCV, VP, VM,

DAT_VP,

SEO_VM

LOAD FOR

1) D+/D- TO RCV/VP/VM/DAT_VP/SEO_VM PROPAGATION DELAYS

2) RCV/VP/VM/DAT_VP/SEO_VM RISE/FALL TIMES (C

= 15pF)

Figure 3. Load for Receiver Propagation Delay and Receiver

Rise/Fall Times

DUT

270Ω

TEST POINT

V = 2/3 x V

DAT_VP

SEO_VM

Figure 4. Load for DAT_VP, SE0_VM Enable/Disable Time

Measurements

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 32 33

MAX3301E 1

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