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参数资料
| 型号： | MAX1604 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual-Channel CardBus and PCMCIA Power Switches with SMBus⑩ Serial Interface |
| 中文描述： | 双通道CardBus和PCMCIA电源开关，带有SMBus串行接口 |
| 文件页数： | 14/16页 |
| 文件大小： | 190K |
| 代理商： | MAX1604 |
M
Dual-Channel CardBus and PCMCIA
Power S witc hes with S MBus S erial Interfac e
14
______________________________________________________________________________________
SMBCLK
A
B
C
D
E
F
G
H
I
J
K
SMBDATA
t
SU:STA
t
HD:STA
t
LOW
t
HIGH
t
SU:DAT
t
HD:DAT
t
SU:STO
t
BUF
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTOSLAVE
C = LSB OF ADDRESS CLOCKED INTOSLAVE
D = R/W BIT CLOCKED INTOSLAVE
E = SLAVE PULLS SMBDATA LINE LOW
L
M
F = ACKNOWLEDGE BIT CLOCKED INTOMASTER
G = MSB OF DATA CLOCKED INTOSLAVE (OP/SUS BIT)
H = LSB OF DATA CLOCKED INTOSLAVE
I = SLAVE PULLS SMBDATA LINE LOW
J = ACKNOWLEDGE CLOCKED INTOMASTER
K = ACKNOWLEDGE CLOCK PULSE
L = STOP CONDITION, DATA EXECUTED BY SLAVE
M = NEW START CONDITION
Figure 3. SMBus Write Timing Diagram
S MBus Read Operations
If the IC receives a valid address that includes a read
bit, the IC becomes a slave transmitter. After receiving
the address data, the IC generates an acknowledge
during the acknowledge clock pulse and drives the
SMBDATA line in sync with SMBCLK. The SMB proto-
col requires that the master end the read transmission
by not acknowledging during the acknowledge bit of
SMBCLK. These PC Card ICs support the repeated
start-condition method for changing data-transfer direc-
tion; that is, a write transmission followed by a repeated
start instead of a stop condition prepares the IC for
data reading (Figure 4).
S MBus Interrupts
These PC Card power-switch ICs are slave devices
only, and never initiate communications except by
asserting an interrupt (by pulling
SMBALERT
low).
Interrupts are generated only for reporting fault condi-
tions, including overcurrent at VCCA, VCCB, VPPA, or
VPPB, undervoltage lockout, and IC thermal overload. If
an interrupt occurs, it can be an indication of impend-
ing system failure. The host system can react by going
into suspend mode or taking other action. It can come
back later to interrogate the IC via the interrupt pointer
to determine status or perform corrective action (such
as disabling the appropriate power switch that might
be connected to a shorted PC card). The fastest
method for turning off the switches in response to a
fault condition is to cycle the voltage on VL in order to
generate a power-on reset (which clears all of the
SMBus registers). Note that the SMBus registers retain
their data even if the main VX/VY supplies are turned
off, provided that VL remains powered.
When a fault occurs,
SMBALERT
is immediately assert-
ed and latched low. If the fault is momentary and disap-
pears before the IC is serviced, the data is still latched
in the interrupt pointer and
SMBALERT
remains assert-
ed. Normally, the master (host system or PCMCIA digi-
tal controller) now sends out the interrupt pointer
address (00011000) followed by a read bit.
SMBALERT
is cleared and the PC Card IC responds by putting out
its address on the bus. If the fault persists,
SMBALERT
is re-asserted, but the data in the fault registers is not
reloaded. The data in the fault latches only reflects the
first time
SMBALERT
is asserted.
When the part enters operating mode, a false interrupt
flag may be issued. The user needs to send the inter-
rupt address to clear the false interrupt.
Normally, the master sends out the appropriate PC Card
switch address on the bus, followed by a read bit. The
data in the fault registers is then clocked out onto the
bus (which also clears the fault registers). If the fault
persists, the fault bits and
SMBALERT
are latched
again.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16040LLA23+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.32V 8PIN UDFN - Rail/Tube |
| MAX16040LLA23+T | 功能描述:监控电路 Battery Backup 2.5V-Ep RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX16040LLA26+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.63V 8PIN UDFN - Rail/Tube |
| MAX16040LLA26+T | 功能描述:监控电路 Battery Backup 2.63V RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX16040LLA29+ | 制造商:Maxim Integrated Products 功能描述:VOLT SUPERVISOR MONITOR 2.93V 8PIN UDFN - Rail/Tube |
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