参数资料
型号: RM48L950PGET
厂商: TEXAS INSTRUMENTS INC
元件分类: 微控制器/微处理器
英文描述: 32-BIT, FLASH, 200 MHz, RISC MICROCONTROLLER, PQFP144
封装: GREEN, PLASTIC, LQFP-144
文件页数: 41/154页
文件大小: 2807K
代理商: RM48L950PGET
PRODUCTPREVIEW
SDA
SCL
t
w(SDAH)
t
w(SCLL)
t
w(SCLH)
t
w(SP)
t
h(SCLL-SDAL)
t
h(SDA-SCLL)
t
h(SCLL-SDAL)
t
su(SCLH-SDAL)
t
f(SCL)
t
c(SCL)
t
r(SCL)
t
su(SCLH-SDAH)
Stop
Start
Repeated Start
Stop
t
su(SDA-SCLH)
SPNS174
– SEPTEMBER 2011
5.8.2
I2C I/O Timing Specifications
Table 5-14. I2C Signals (SDA and SCL) Switching Characteristics(1)
Parameter
Standard Mode
Fast Mode
Unit
MIN
MAX
MIN
MAX
tc(I2CCLK)
Cycle time, Internal Module clock for I2C,
75.2
149
75.2
149
ns
prescaled from VCLK
tc(SCL)
Cycle time, SCL
10
2.5
ms
tsu(SCLH-SDAL)
Setup time, SCL high before SDA low (for a
4.7
0.6
ms
repeated START condition)
th(SCLL-SDAL)
Hold time, SCL low after SDA low (for a repeated
4
0.6
ms
START condition)
tw(SCLL)
Pulse duration, SCL low
4.7
1.3
ms
tw(SCLH)
Pulse duration, SCL high
4
0.6
ms
tsu(SDA-SCLH)
Setup time, SDA valid before SCL high
250
100
ns
th(SDA-SCLL)
Hold time, SDA valid after SCL low (for I2C bus
0
3.45(2)
0
0.9
ms
devices)
tw(SDAH)
Pulse duration, SDA high between STOP and
4.7
1.3
ms
START conditions
tsu(SCLH-SDAH)
Setup time, SCL high before SDA high (for STOP
4.0
0.6
ms
condition)
tw(SP)
Pulse duration, spike (must be suppressed)
0
50
ns
Cb
(3)
Capacitive load for each bus line
400
pF
(1)
The I2C pins SDA and SCL do not feature fail-safe I/O buffers. These pins could potentially draw current when the device is powered
down.
(2)
The maximum th(SDA-SCLL) for I2C bus devices has only to be met if the device does not stretch the low period (tw(SCLL)) of the SCL
signal.
(3)
Cb = The total capacitance of one bus line in pF.
Figure 5-8. I2C Timings
Copyright
2011, Texas Instruments Incorporated
Peripheral Information and Electrical Specifications
135
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