UPSD3422 datasheet(127/293 Pages) STMICROELECTRONICS

127 / 293 page

uPSD34xx

I2C interface

127/293

Table 62.

S1SETUP examples for various I2C bus speeds and oscillator frequencies

Note:

Not compatible with High Speed I2C.

23.13

I2C operating sequences

The following pseudo-code explains hardware control for these I2C functions on the

uPSD34xx:

●

Initialize the Interface

●

Function as Master-Transmitter

●

Function as Master-Receiver

●

Function as Slave-Transmitter

●

Function as Slave-Receiver

●

Interrupt Service Routine

Full C code drivers for the uPSD34xx I2C interface, and other interfaces are available from

the web at www.st.com\psm.

Initialization after a uPSD34xx reset

Ensure pins P3.6 and P3.7 are GPIO inputs

–

SFR P3.7 = 1 and SFR P3.6 = 1

Configure pins P3.6 and P3.7 as I2C

–

SFR P3SFS.6 = 1 and P3SFS.7 = 1

I2C Bus

Speed,

fSCL

Parameter

Oscillator Frequency, fOSC

6 MHz

12 MHz

24 MHz

33 MHz

40 MHz

Standard

Recommended

S1SETUP Value

93h

A7h

CFh

EEh

FFh

Number of Samples

111

128

Time Between

Samples

166.6ns

83.3ns

41.6ns

30ns

25ns

Total Sampled Period

3332ns

3333ns

3200ns

Fast

Recommended

S1SETUP Value

82h

85h

8Bh

90h

93h

Number of Samples

Time Between

Samples

166.6ns

83.3ns

41.6ns

30ns

25ns

Total Sampled Period

500ns

510ns

500ns

High

Recommended

S1SETUP Value

(Note 1)

Number of Samples

1345

Time Between

Samples

83.3ns

41.6ns

30ns

25ns

Total Sampled Period

83.3

125ns

120ns

125ns

UPSD3422 bảng dữ liệu(PDF) 127 Page - STMicroelectronics

UPSD3422 bảng dữ liệu(HTML) 127 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

bảng dữ liệu tải về

Link URL