at83c5132 ATMEL Corporation, at83c5132 Datasheet - Page 27

• Manufacturer Part Number: at83c5132
• Description: Usb Microcontroller With 64k Bytes Flash Memory
• Manufacturer: ATMEL Corporation

Two-wire Interface
Timings
Waveforms
4173CS–USB–07/04
(INPUT/OUTPUT)
(INPUT/OUTPUT)
SDA
SCL
START or Repeated START condition
Table 1. TWI Interface AC Timing
V
Notes:
Figure 9. Two Wire Waveforms
T
DD
hd
;STA
T
T
T
T
= 2.7 to 3.3 V, T
T
T
T
T
Symbol
SU
SU
SU
fd
SU
HD
HD
SU
T
T
T
T
T
; DAT1
; DAT2
; DAT3
T
T
HIGH
; STO
LOW
; STA
; STA
; DAT
BUF
RC
FC
RD
FD
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·T
4. T
T
100 kbit/s.
resistor, this must be < 1 µs.
out. Maximum capacitance on bus-lines SDA and
SCL= 400 pF.
low
CLCL
T
T
= T
rd
high
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
rc
OSC
Tsu;DAT1
A
= one oscillator clock period.
= -40 to +85°C
T
hd;
DAT
Parameter
T
fc
STOP condition
Repeated START condition
Tsu;DAT
T
su;
DAT3
2
T
14·T
16·T
14·T
14·T
14·T
14·T
T
0.3 V
su
su
INPUT
250 ns
250 ns
250 ns
0.3 µs
0.3 µs
0.7 V
;STO
Max
0 ns
1 µs
1 µs
Min
;STA
CLCL
CLCL
CLCL
CLCL
CLCL
CLCL
AT89C5132
DD
DD
(4)
(4)
(4)
(4)
(4)
(4)
CLCL
T
buf
START condition
20·T
8·T
will be filtered
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
CLCL
0.7 V
1 µs
Max
Min
0.3 V
CLCL
-
-
(2)
(4)
(2)
(4)
(1)
(1)
(1)
(1)
(3)
(1)
(1)
(1)
(3)
DD
- T
- T
(4)
DD
FC
RD
31