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參數(shù)資料
| 型號(hào)： | EVB90308 |
| 廠商： | Melexis Technologies NV |
| 文件頁(yè)數(shù)： | 28/28頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | DEMO KIT MLX90308 SENS INTERFACE |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，傳感器至模數(shù)轉(zhuǎn)換器接口，可編程 |
| 嵌入式： | 是，MCU，8 位 |
| 已用 IC / 零件： | MLX90308 |
| 主要屬性： | 用于橋型傳感器的 MCU 控制信號(hào)調(diào)節(jié) |
| 次要屬性： | GUI 輸出類(lèi)型：絕對(duì)電壓，比率制電壓，電流輸出模式 |
| 已供物品： | 板，文檔，樣品，軟件 |
| 產(chǎn)品目錄頁(yè)面： | 1460 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | MLX90308LDF-DAA-000-TU-ND - IC SENSOR PROG INTERFACE 16-SOIC |
| 其它名稱(chēng)： | DK90308 DK90308-ND |
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MLX90308
Programmable Sensor Interface
Analog Features
Supply Regulator
A bandgap-stabilized supply-regulator is on-chip while
the pass-transistor is external. The bridge-type sensor
is typically powered by the regulated supply (typically
4.75V). For ratiometric operation, the supply-regulator
can
be
disabled
by
connecting
together
the
unregulated and regulated supply pins.
Oscillator
The MLX90308 contains a programmable on-chip RC
oscillator. No external components are needed to set
the frequency (87.8 kHz +/-1%). The MCU-clock is
generated by a PLL (phase locked loop tuned for 614
kHz or 2.46 Mhz) which locks on the basic oscillator.
The frequency of the internal clock is stabilized over
the full temperature range, which is divided into three
regions, each region having a separate digital clock
setting. All of the clock frequency programming is
done by Melexis during final test of the component.
The device uses the internal temperature sensor to
determine which temperature range setting to use.
A/D and D/A
Power-On Reset
The Power-On Reset (POR) initializes the state of the
digital part after power up. The reset circuitry is
completely internal. The chip is completely reset and
fully operational 3.5 ms from the time the supply crosses
3.5 volts. The POR circuitry will issue another POR if
the supply voltage goes below this threshold for 1.0 us.
Test Mode
For 100% testability, a "TEST" pin is provided. If the pin
is pulled low, then the monitor program is entered and
the
chip
changes
its
functionality.
In
all
other
applications, this pin should be pulled high or left
floating (internal pull-up).
Temperature Sense
The temperature measurement, TPO, is generated from
the external or internal temperature sensor. This is
converted to a 10-bit number for use in calculating the
signal compensation factors. A 2-bit coarse adjustment
GNTP[1:0] is used for the temperature signal gain &
offset adjustment.
Conversions using only one DAC
For saving chip area, the "Offset DAC" is multiplexed
in various ways. Both "fine offset" and "digital mode"
signals are stored on a capacitor. An ADC-loop is
available by using a comparator and SAR.
D/A
Before changing to another capacitor, the DAC output
should be settled to the new value. For example,
MODSEL moves the analog multiplexer to the so-
called "open state 0." At the same time, the 10 bit mux
selects OF[9:0] for the offset-DAC. After the DAC
settling time, the analog multiplexer is moved to its
final state
and the
DAC-output is stored on a
capacitor.
A/D
The S/W-Signal MODSEL connects the SAR-output to
the DAC and the DAC-output to the comparator. The
SARegister is initialized by a rising edge of STC (S/W
signal). At the end of the A/D conversion, the
EOC flag is set to 1 and the controller can read the
ADC values.
3901090308
Page 9
May/12
Rev 007
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