MSM7728 データシートの表示（PDF） - Oki Electric Industry

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MSM7728

Single Rail Linear CODEC

Oki Electric Industry 

¡ Semiconductor

MSM7728

WRN, RDN, DCLK, CDIN, CDOUT

Serial control ports for microcontroller interface.

Writing data to 8-bit control registers allows controling the transmit speech path/receive speech

path mute, transmit speech path/receive speech path level, PB tone, service tone, and ringer.

WRN is the write control signal input, RDN is the read control signal input, DCLK is the clock

signal input for data shift, CDIN is the control data input, CDOUT is the control data output.

When reset (RSTN=0), the control registers are reset to the initial values as described in "Control

Data Description".

The initial values remains unchanged until control data is written after reset.

Writing of control data: When WRN is at digital "0", data that is entered in CDIN is shifted at the

rising edge of the DCLK signal pulse and is latched in an internal control register.

Reading of control data: When RDN is at digital "0", control data is output from CDOUT at the

rising edge of a DCLK signal pulse.

See Figure 2 for write and read timings.

RINGP, RINGN

Ringer (sounder) drive outputs.

The sounder can be structured by putting a piezo-electric type sounding body (equivalent

capacitance: less than 70nF) between RINGP and RINGN.

LED

Ringer digital level output. This pin is used for LED blinking synchronous with the ringer.

LA

General latch output. This output is used as a control signal for a peripheral circuit because this

output can be set to digital "0" or "1" by writing data from a microcontroller interface.

TOUT

PB tone/service tone output. When SW6 is in the ON state, tone is output.

The output resistance of this pin is approximately 10kW, which should be taken into account

when using it externally.

RSTN

Control register reset signal input. When this pin is set to digital "0" level.

All control registers are reset to the initial values.

Be sure to reset the control registers after turning on the power.

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