參數(shù)資料
型號： XE8000EV121
廠商： Semtech
文件頁數(shù)： 4/53頁
文件大小： 0K
描述： BOARD EVAL FOR SX8723/24
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： 否
已用 IC / 零件： SX8723，SX8724，SX8725
主要屬性： 用于橋型傳感器的信號調(diào)節(jié)
次要屬性： GUI，最多 16 位，1/12 ~ 1000 可編程增益，I2C 接口
已供物品： 板，CD
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： SX8725E083DKR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082DKR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083CT-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082CT-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083TR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082TR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
ADVANCED COMMUNICATIONS & SENSING
V1.23 2009 Semtech Corp.
www.semtech.com
12
SX8724
ZoomingADC for Pressure and Temperature Sensing
Charge Pump
This block generates a supply voltage able to power the analog switch drive levels on the chip.
The minimum acceptable switch supply is 3V which means that if VBATT drops below 3V then the block should
be activated to generate a voltage of 3V or above. If VBATT is greater than 3V then VBATT may be switched
straight through to the VPUMP output.
If control input bit MULT_FORCE_OFF = 1 in RegMode register then the charge pump is disabled and VBATT is
permanently connected to VPUMP.
If control input bit MULT_FORCE_ON = 1 in RegMode register then the charge pump is permanently enabled.
This overrides MULT_FORCE_OFF bit in RegMode register.
If MULT_FORCE_ON = 0 and MULT_FORCE_OFF = 0 bits in RegMode register then the charge pump will
start if VBATT drops below 3V, otherwise VBATT will be switched directly through to VPUMP.
These controls are supplied to give the user the option of fixing the charge pump state to avoid it turning off and
on when VBATT is close to 3V.
The cell will use the on-chip bandgap reference and comparator to detect when VBATT is too low. When
activated, the block will use the charge pump to boost the VBATT voltage to above 3V but with diode limiting to
ensure that the generated voltage never exceeds 0.7V above VBATT.
An external capacitor is required on VPUMP whenever the power supply is supposed to be less or drop below 3V.
This capacitor should be large enough to ensure that generated voltage is smooth enough to avoid affecting
conversion accuracy but not so large that it gives an unacceptable settling time. A recommended value is
around 2.2nF.
The block will also indicate when the pumped output voltage is sufficiently high to allow ADC conversions to be
started. This will be a simple comparison which will give a ready signal when the VPUMP output is 3V or above.
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