PCD3312 datasheet(13/28 Pages) PHILIPS

13 / 28 page

1996 Nov 21

Philips Semiconductors

Product speciﬁcation

DTMF/modem/musical-tone generators

PCD3311C; PCD3312C

8.5

Timing speciﬁcations

The PCD3311C and PCD3312C accept data input from a microcontroller and are ‘slave receivers’ when operating via

the I2C-bus. They support the ‘standard’ and ‘low-speed’ modes of the I2C-bus, but not the ‘fast’ mode detailed in

“The

I2C-bus and how to use it” document order no. 9398 393 40011. The timing requirements for the devices are described

in Sections 8.5.1 and 8.5.2.

8.5.1

STANDARD MODE

Masters generate a bus clock with a maximum frequency of 100 kHz. Detailed timing is shown in Fig.11, where the two

signal levels are LOW = VIL and HIGH = VIH, see Chapter 11. Figure 12 shows a complete data transfer in standard

mode. The time symbols are explained in Table 6.

Fig.11 Standard mode timing.

handbook, full pagewidth

MBC764

t BUF

t f

t HIGH

t SU;DAT

t SU;STO

t HD;DAT

t SU;STA

t r

t LOW

t HD;STA

SDA

SCL

SDA

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