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鍙冩暩(sh霉)璩囨枡
| 鍨嬭櫉锛� | MAX1254BEUE+T |
| 寤犲晢锛� | Maxim Integrated Products |
| 鏂囦欢闋佹暩(sh霉)锛� | 2/29闋� |
| 鏂囦欢澶�?銆�?/td> | 0K |
| 鎻忚堪锛� | IC ADC 12BIT W/REF 16-TSSOP |
| 鐢�(ch菐n)鍝佸煿瑷�(x霉n)妯″锛� | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 妯�(bi膩o)婧�(zh菙n)鍖呰锛� | 2,500 |
| 浣嶆暩(sh霉)锛� | 12 |
| 閲囨ǎ鐜囷紙姣忕锛夛細 | 94k |
| 鏁�(sh霉)鎿�(j霉)鎺ュ彛锛� | MICROWIRE?锛孮SPI?锛屼覆琛�锛孲PI? |
| 杞�(zhu菐n)鎻涘櫒鏁�(sh霉)鐩細 | 1 |
| 鍔熺巼鑰楁暎锛堟渶澶э級锛� | 15mW |
| 闆诲闆绘簮锛� | 妯℃摤鍜屾暩(sh霉)瀛楋紝闆� ± |
| 宸ヤ綔婧害锛� | -40°C ~ 85°C |
| 瀹夎椤炲瀷锛� | 琛ㄩ潰璨艰 |
| 灏佽/澶栨锛� | 16-TSSOP锛�0.173"锛�4.40mm 瀵級 |
| 渚涙噳(y墨ng)鍟嗚ō(sh猫)鍌欏皝瑁濓細 | 16-TSSOP |
| 鍖呰锛� | 甯跺嵎 (TR) |
| 杓稿叆鏁�(sh霉)鐩拰椤炲瀷锛� | 8 鍊嬪柈绔�锛屽柈妤碉紱8 鍊嬪柈绔�锛岄洐妤�锛�4 鍊嬪樊鍒嗭紝鍠サ锛�4 鍊嬪樊鍒�锛岄洐妤� |
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MAX1253/MAX1254
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and VDD Monitor
10
______________________________________________________________________________________
GND
a) VOL TO VOH
CLOAD = 100pF
100nA
DOUT
GND
VDD
b) HIGH-Z TO VOL AND VOH TO VOL
CLOAD = 100pF
100nA
DOUT
Figure 1. Load Circuits for DOUT Enable Time and SCLK to
DOUT Delay Time
GND
a) VOH TO HIGH-Z
CLOAD = 100pF
100nA
DOUT
GND
VDD
b) VOL TO HIGH-Z
CLOAD = 100pF
100nA
DOUT
Figure 2. Load Circuit for DOUT Disable Time
Detailed Description
The MAX1253/MAX1254 are precision-monitoring inte-
grated circuit systems specifically intended for stand-
alone operation. They can monitor diverse types of
inputs, such as those from temperature sensors and
voltage signals from pressure, vibration, and accelera-
tion sensors, and digitize these input signals. The digi-
tal values are then compared to preprogrammed
thresholds and, if the thresholds are exceeded, the
processor is alerted by an interrupt signal. No interac-
tion by the CPU or microcontroller (C) is required until
one of the programmed limits is exceeded (Figures 3
and 4).
Voltages on all the inputs are converted to 12-bit values
sequentially and stored in the current data registers.
Note that eight of these inputs are external and two are
internal. One of the internal inputs monitors the VDD
voltage supply, while the other monitors the internal IC
temperature. AIN0 to AIN7 can be configured as either
single ended (default) or differential. In addition, these
inputs can be configured for single-ended or differen-
tial temperature measurements. In the temperature
configuration, the device provides the proper bias nec-
essary to measure temperature with a diode-connected
transistor sensor. The user enables which inputs are
measured (both external and internal) and sets the
delay between each sequence of measurements dur-
ing the initial setup of the device.
The values stored in the current data registers are com-
pared to the user-preprogrammed values in the thresh-
old registers (upper and lower thresholds) and, if
exceeded, activate the interrupt output and generate an
alarm condition. If desired, the device can be pro-
grammed to average the results of many measurements
before comparing to the threshold value. This reduces
the sensitivity to external noise in the measured signal.
In addition, the user can set the number of times the
threshold is exceeded (fault cycles) before generating
an interrupt. This feature reduces falsely triggered
alarms caused by undesired, random spurious impulses.
When the fault cycle criterion is exceeded, an alarm
condition is created. The device writes the fault condi-
tion into the alarm register to indicate the alarmed input
channel.
Converter Operation
The MAX1253/MAX1254 ADCs use a fully differential
successive-approximation register (SAR) conversion
technique and an on-chip track-and-hold (T/H) block to
convert temperature and voltage signals into a 12-bit
digital result. Both single-ended and differential config-
urations are supported with a unipolar signal range for
single-ended mode and bipolar or unipolar ranges for
differential mode. Figure 5 shows the equivalent input
circuit for the MAX1253/MAX1254. Configure the input
channels according to Tables 5 and 6 (see the Input
Configuration Register section).
In single-ended mode, the positive input (IN+) is con-
nected to the selected input channel and the negative
input (IN-) is connected to GND. In differential mode,
IN+ and IN- are selected from the following pairs:
AIN0/AIN1, AIN2/AIN3, AIN4/AIN5, and AIN6/AIN7.
Once initiated, voltage conversions require 10.6s (typ)
to complete.
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