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参数资料
| 型号： | DS2480S |
| 英文描述： | Serial 1.Wire Line Driver |
| 中文描述： | 串行1.Wire线驱动器 |
| 文件页数： | 16/26页 |
| 文件大小： | 185K |
| 代理商： | DS2480S |
DS2480
042498 16/26
Certain applications may require a duration for a strong
pull–up or programming pulse that cannot be realized
using one of the predefined values. Selecting infinite
duration allows the host to generate pulses of any
length. As a consequence, however, the host becomes
responsible to actively control the duration of the pulse.
Failing to do so may require a power–on reset or master
reset cycle of the DS2480. For this reason, infinite dura-
tion should only be used if absolutely necessary.
The time to end a pulse of infinite duration strongly
depends on the baud rate of the communication
between host and DS2480. Neglecting the response
time of the host, the minimum pulse durations are:
86.8
μ
s at 115.2 kbps, 173.6
μ
s at 57.6 kbps, 520
μ
s at
19.2 kbps and 1.04 ms at 9.6 kbps.
STRONG PULL–UP TO 5V, INFINITE DURATION
Figure 7c
END OF PREVIOUS
TIME SLOT
5V
0V
BEGIN OF NEXT
TIME SLOT
STRONG PULL–UP ON
t
1
t
2
t
3
t
4
IDLE
TIME
IDLE
TIME
As before, processing the command is essentially the
same, regardless if it is for a strong pull–up or a pro-
gramming pulse. At t
1
the host starts sending the pulse
command byte. At t
2
the DS2480 has received the com-
mand and immediately activates the strong pull–up or
switches in the 12V programming voltage. To end the
pulse, the DS2480 must receive a termination com-
mand, code F1h, which occurs at t
3
. The termination
command does not generate a response byte. The
DS2480 will immediately end the pulse and send out the
response byte of the pulse command. The idle time
between t
1
and t
2
is determined by the time to transmit
the command byte at the selected baud rate. The idle
time between t
3
and t
4
is comprised of the time to trans-
mit the pulse response byte, plus the response time of
the host plus the time to transmit the command and/or
data to generate the next time slot.
12V PROGRAMMING PULSE, INFINITE DURATION
Figure 7d
t
1
t
3
t
4
t
2
5V
END OF PREVIOUS
TIME SLOT
BEGIN OF NEXT
TIME SLOT
12V
0V
STEEP SLOPES
PROGRAMMING VOLTAGE
IS APPLIED
IDLE
TIME
IDLE
TIME
相关PDF资料 |
PDF描述 |
|---|---|
| DS2490 | USB to 1-Wire Bridge Chip |
| DS2490S | USB to 1-Wire Bridge Chip |
| DS2502-E64 | IEEE EUI-64 Node Address Chip |
| DS26334 | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
| DS26334G | 3.3V, 16-Channel, E1/T1/J1 Short and Long-Haul Line Interface Unit |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2482-100 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Single-Channel 1-Wire Master |
| DS2482-100_12 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Channel 1-Wire Master |
| DS2482-101 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Channel 1-Wire Master with Sleep Mode |
| DS2482-101_12 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Single-Channel 1-Wire Master with Sleep Mode |
| DS2482-800 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:8-Channel 1-Wire Master |
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