AT89C51SND1C-ROTIL ATMEL Corporation, AT89C51SND1C-ROTIL Datasheet - Page 37

• Manufacturer Part Number: AT89C51SND1C-ROTIL
• Description: Single-Chip Microcontroller with MP3 Decoder and Man-Machine Interface
• Manufacturer: ATMEL Corporation

Two-wire Interface
Timings
Waveforms
Figure 23. TWI Waveforms
4106F–8051–10/02
(INPUT/OUTPUT)
(INPUT/OUTPUT)
SDA
SCL
START or Repeated START Condition
T
HD
;STA
T
FD
Table 47. TWI Interface AC Timing
zV
Notes:
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
SU
SU
SU
SU
SU
RC
RD
T
HD
LOW
HIGH
FC
HD
BUF
FD
DD
LOW
; DAT1
; DAT2
; DAT3
; STA
; STO
; STA
; DAT
= 2.7 to 3.3V, T
T
T
HIGH
rd
1. At 100 kbit/s. At other bit-rates this value is inversely proportional to the bit-rate of
2. Determined by the external bus-line capacitance and the external bus-line pull-up
3. Spikes on the SDA and SCL lines with a duration of less than 3·
4.
T
rc
100 kbit/s.
resistor, this must be < 1 µs.
out. Maximum capacitance on bus-lines SDA and SCL = 400 pF.
T
T
CLCL
SU
;DAT1
Parameter
Start condition hold time
SCL Low Time
SCL High Time
SCL Rise Time
SCL Fall Time
Data Set-up Time
SDA Set-up Time (before repeated START condition)
SDA Set-up Time (before STOP condition)
Data Hold Time
Repeated START Set-up Time
STOP condition Set-up Time
Bus Free Time
SDA Rise Time
SDA Fall Time
= T
OSC
A
T
= -40° to +85°C
HD
= one oscillator clock period.
DAT
T
fc
STOP Condition
Repeated START Condition
Tsu;DAT
T
su;
DAT3
2
T
T
0.3
su
SU
0.7
;STO
AT8xC51SND1C
;
STA
V
V
DD
DD
14·T
16·T
14·T
14·T
14·T
14·T
T
INPUT
250 ns
250 ns
250 ns
0.3 µs
0.3 µs
buf
START Condition
Max
1 µs
0 ns
1 µs
Min
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
(4)
(4)
(4)
(4)
(4)
(4)
0.7
T
0.3
CLCL
V
20·T
V
DD
8·T
will be filtered
DD
OUTPUT
8·T
CLCL
4.0 µs
4.7 µs
4.0 µs
0.3 µs
4.7 µs
4.0 µs
4.7 µs
0.3 µs
Note
CLCL
1 µs
Max
Min
CLCL
-
(2)
(4)
(4)
(1)
(2)
(1)
(1)
(1)
(3)
(1)
(1)
(1)
(3)
- T
- T
(4)
FC
RD
37