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SM5964A Datasheet, PDF (12/30 Pages) SyncMOS Technologies,Inc – 8-Bit Micro-controller With 64KB ISP Flash & TWSI & PWM & 1KB RAM embedded
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SyncMOS Technologies International, Inc.
SM5964A
START or repeat START condition
8-Bit Micro-controller
With 64KB ISP Flash & TWSI & PWM & 1KB RAM embedded
STOP condition
repeat START condition
tSU;STA
SDA
tFD
tRD
tRC
tHD;DAT
tFC
0.7VCC
0.3VCC
tSP
tBUF
START
tSU;STO
SCL
tHD;STA
tLOW
tHIGH
tSU;DAT1
tSU;DAT
Figure 11 Timing waveform of TWSI interface
tSU;DAT2
tSU;DAT3
Symbol
fSCL
tBUF
tHD;STA
tLOW
tHIGH
tSU;STA
tHD;DAT
tSU;DAT
tRD,tRC
tFD tFC
tSU;STO
tSU;STA
Cb
tSP
FIGURE
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11
11
11
11
11
11
11
11
11
11
11
11
PARAMETER
TWSI Bus
SCL clock frequency
Bus free time between a stop and stop condition
Hold time (repeated) START condition. After this
period, the first clock pulse is generated
Low Period of the SCL clock
High period of the SCL clock
Set-up time of a repeated START condition
Data hold time
Data Setup-Time
Rise time of both SDA and SCL
Fall time of both SDA and SCL
Set-up time for STOP and START condition
Capacitive load for each bus line
Pulse width of spikes which must be suppressed by
input filter
Standard-MODE
MIN
MAX
Fast-MODE
MIN
UNIT
MAX
0
100
0
4.7
-
1.3
400 kHz
-
μS
4.0
-
0.6
-
μS
4.7
-
1.3
-
μS
4.7
-
1.3
-
μS
4.0
-
0.6
0
μS
0
-
0
0.9 μS
250
-
100(1)
-
nS
-
1000
20+0.1Cb(2)
300 ns
-
300
20+0.1Cb(2)
300 ns
4.0
-
0.6
-
μS
-
400
-
400 pF
-
-
0
50
nS
NOTES:
1.
2.
A fast-mode TWSI bus device can be used in a standard-mode TWSI bus system, but the requirement tSU;DAT ≥ 250ns must the be met.
This will automatically be the case if the device does not stretch the LOW period of the SCL signal. If such a device does stretch the
LOW period of the SCL signal, it must output the next data bit to SDA line tRMAX + tSU;DAT = 1000 + 250 = 1250 ns (according to the
standard-mode TWSI bus specification) before the SCL line is released.
Cb = Total capacitance of one bus line in pF.
Specifications subject to change without notice contact your sales representatives for the most recent information.
12
Ver 2.3 SM5964A 10/2006
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