W51300 Просмотр технического описания (PDF) - Winbond

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W51300

FLASH VR CONTROLLER

Winbond 

W51300

BWD

This is an active-high, edge-triggered backward pin with an internal 500 KΩ pull-low resistor. Pressing

this pin for less than 1 second moves the CAP from the current voice segment to the previous one.

Pressing this pin for more than 1 second moves the CAP from the current voice segment to the first

one.

RESET

This is an active-high, edge-triggered reset pin with an internal 500 KΩ pull-low resistor. Pressing this

pin for less than 2 seconds causes the system power-on initialization procedure to be executed and

resets the message pointer to 1. Pressing this pin for more than 2 seconds executes the chip erase

procedure, so that all of the recorded messages are cleared.

6. Low Battery Warning

A low battery warning function is provided to protect the recorded voice messages from being lost

due to loss of power. Before a recording, erasing, or reset operation, the battery voltage will be

checked. If the voltage falls to 3 volts or below, all operations except the LED stop, and the LED

flashes at 3 Hz for 2 seconds to indicate that the battery is low.

7. Speaker Output

The W51300 provides two types of speaker drivers, direct drive and current output. The direct drive is

a voltage output from the built-in power amplifier. This output can be used to drive a speaker directly

without any extra components, such as resistors or transistors. The maximum driving current is 56

mA (rms) when the output is connected to a 16Ω speaker. The current output is the same as that of

the standard speaker driver used in most Winbond PowerSpeechTM chips. The maximum driving

current is 5 mA when VCC = 4.5V.

8. Sampling Frequency Adjustment

The external ROSC can be adjusted to change the system clock (FOSC) and sampling frequency (Fs).

The relationship between FOSC and Fs is Fs = FOSC/32. The relationship between Fs and ROSC is

shown is the figure below.

35

30

25

20

15

Fs (KHz)

10

5

0

0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 2,800 3,000 3,200

Rosc (KOhm)

-6-

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