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參數(shù)資料
| 型號(hào)： | MAX1254BEUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Stand-Alone, 10-Channel, 12-Bit System Monitors with Internal Temperature Sensor and VDD Monitor |
| 中文描述： | 9-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁(yè)數(shù)： | 23/29頁(yè) |
| 文件大?。?/td> | 439K |
| 代理商： | MAX1254BEUE |
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M
Stand-Alone, 10-Channel, 12-Bit System Monitors
with Internal Temperature Sensor and V
DD
Monitor
______________________________________________________________________________________
23
ential, or unipolar/bipolar), carry out the following steps
to execute a manual conversion. See Figure 9 for man-
ual conversion timing:
1) Disable autoscan (set up register scan mode bit to
zero), if necessary.
2) Pull
CS
low.
3) Initiate a conversion by issuing a Manually Triggered
Conversion command (0000, followed by the
address bits of the channel to be converted).
4) Pull
CS
high to start the conversion.
5) Maintain a logic high on
CS
to allow for reference
power-up (if the reference mode requires it) and
conversion time.
6) Pull
CS
low.
7) Issue a Read Current Data Register for Selected-
Channel command (0010, followed by the same
address of the channel in the Manually Triggered
Conversion command).
Voltage Measurements
Every voltage measurement (internal V
DD
or external
input channel) requires 10.6μs to complete. If the inter-
nal reference needs to power up (reference mode =
01), an additional 40μs is required every time the
MAX1253/MAX1254 come out of automatic shutdown
mode after a sample wait period greater than 80μs.
Monitoring V
DD
This internal acquisition channel samples and converts
the supply voltage, V
DD
.
V
DD
value can be calculated from the digitized data
with the following equation:
The reference voltage must be larger than 1/2V
DD
for
the operation to work properly. V
DD
monitoring requires
10.6μs (typ) per measurement.
Temperature Measurement
The MAX1253/MAX1254 perform temperature measure-
ment by measuring the voltage across a diode-con-
nected transistor at two different current levels. The
following equation illustrates the algorithm used for
temperature calculations:
where:
V
HIGH
= sensor-diode voltage with high current flowing
(I
HIGH
)
V
LOW
= sensor-diode voltage with low current flowing
(I
LOW
)
q = charge of electron = 1.602
10
-19
coulombs
k = Boltzman constant = 1.38
10
-23
J/K
n = ideality factor (slightly greater than 1)
temperature
V
V
x
HIGH
LOW
=
(
)
-
q
k
n xln
I
I
High
LOW
V
x current data register content x
(
_
_
V
4096
DD
REF
=
2
_
)
C3
C2
C1 C0
A2
A1
A0
SCLK
DIN
DOUT
C3
C2
C1 C0
A2
A1
A0
A3
A3
CS
t
PU+CONV
Figure 9. Manual Conversion Timing Without Reading Data
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1254BEUE+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10Ch 94ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1254BEUE+T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit 10Ch 94ksps 5V Precision ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1254BEUE-T | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1254EVC16 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Stand-Alone 10-Channel 12-Bit System Monitors with Internal Temperature Sensor and VDD Monitor RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類(lèi)型:Differential 信噪比:107 dB 接口類(lèi)型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX1254EVKIT | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 Evaluation Kit/Evaluation System for the MAX1254 MAX1253 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類(lèi)型:ADC 工具用于評(píng)估:ADS130E08 接口類(lèi)型:SPI 工作電源電壓:- 6 V to + 6 V |
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