參數(shù)資料
型號(hào)： SMD1108
廠商： Summit Microelectronics, Inc.
英文描述： 8-Channel Auto-Monitor ADC In System Programmable Analog (ISPA) Device
中文描述： 8通道自動(dòng)監(jiān)控ADC的在系統(tǒng)可編程模擬（ISPA）設(shè)備
文件頁(yè)數(shù)： 26/29頁(yè)
文件大小： 734K
代理商： SMD1108
26
SMD1108
2052 2.0 10/05/01
Preliminary
SUMMIT MICROELECTRONICS, Inc.
Temperature Sensor
The internal temperature sensor can be accessed as a
multiplexed optional input on CH3. Channel 3 can be set
to read an internal temperature dependant device with a
range of ±128oC. The 10-bit ADC converts the tempera-
ture reading to data in 2’s complement format, and is
accurate to oC. The GUI software can enable the
Temperature Sensor and will change the displayed read-
ing on CH3 from volts to oC.
Instant Action Block
A single channel of the Instant Action Block is shown in
Figure 8. The SMD1108 has a block of 12 nonvolatile
threshold comparators dedicated to monitoring the status
of the supply lines, they are arranged as:
Four Over-Voltage comparators,
Four Under-Voltage comparators, and
Four Over-Current comparators.
This structure has been adopted to ensure all supplies are
continuously monitored, because if a supply interruption
occurred while the ADC was sampling another channel
the interruption could be missed.
Each channel can set the UV threshold anywhere in the
range from 0.9V to 6V in 20mV steps. OV thresholds are
offset from the UV threshold, and the value to be entered
into the register can be calculated from:
)
[\
`^
[\
dbde
[\
]^
_ `^
abc
×
×
.
When the UV threshold is enabled it is internally ORed to
the RST# signal. Please note if UV Override (UV_OVRD)
is active then these thresholds are ignored. UV Override
is provided to allow voltage margining during production
‘burning in’ of the line cards; this prevents Alarm signals
from being generated during this test. The over-current
comparator is offset from the input voltage by a program-
mable threshold, which can be set to 50, 75 or 150mV.
Selection of the sense resistor is made using Ohms Law,
for example:
Offset Voltage / Max Current = R sense
If a Two Amp limit using the 150mV threshold is specified,
it would require a resistance of 75m
.
Sense resistors
Care should be taken when designing the PCB layout for
the Sense resistors. A Kelvin, or 4 Wire, connection
scheme should be adopted as shown in Figure 10. Circuit
accuracy can be affected if the PCB trace to the resistor
is not optimized. Voltage drops across copper traces due
to current flow can cause additional errors.
Each of the alarm signals can be used to change the status
of the following outputs: HEALTHY#, FAULT#,
FAULT_IRQ#, RST#, OV_IRQ#, and OC_IRQ#
Environmental Automonitor Blocks
The 4 environmental channels, Channels 0 through 3, are
monitored autonomously by the internal logic of the
SMD1108 when it is in Automonitor mode and the indi-
vidual channels have been enabled. The ADC continuous
samples the input and compares the value against two
pre-programmed values held in a nonvolatile store.
Figure 10. Kelvin-connected Sense Resistor
Sense Resistor
High Current Path
Kelvin
Sense
Traces
2052 Fig10
Figure 11. Alert Threshold Settings
Monitor
Option Bits
x x
Lower
Upper
2052 Fig11
ALERT
REGION
ALERT
REGION
ALERT
REGION
ALERT
REGION
3FF
indicates
alert set if
conv = limit
Upper limit
Dashed line
alertindicates
if conv = limit
000
"00"
"01"
"10"
"11"
3FF
000
ALERT
REGION
ALERT
REGION
3FF
000
3FF
000
Lower limit
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