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PDF FS9701B Data sheet ( Hoja de datos )
| Número de pieza | FS9701B | |
| Descripción | (FS970x) DMM Analog Front End | |
| Fabricantes | Fortune Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FS9701B (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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REV. 4.2 FS970X-DS-42_EN
www.DataSheet4U.com
Datasheet
FS970X
5,000/50,000 counts DMM analog front end.
FEB 2007
1 page  
FS970X
1. General Description
FS970X is a series of Digital Multi-function Meter (DMM) front-end chip. The core is a high resolution Σ-∆ ADC,
combined with function network, operation amplifier, comparator, digital filter, crystal oscillator circuit, digital
control logic and micro processor interface.
FS970X ADC includes not only high-resolution output to achieve accurate measurement, but high-speed ADC
output to display the bar graph of digital meter and to measure +/- peak hold.
www.DataSheet4U.comCombined with a micro processor, FS970X can function as an auto-range DMM to measure DC/AC voltage,
DC/AC current, resistance, frequency, peak hold and diode, etc. In addition, it includes several sets of
programmable ADC direct input to expand product applicability (such as pressure function, temperature
function, etc….)
There are two operation amplifiers built in FS970X to act as high impedance buffer and DC/AC converter when
measuring AC voltage. These two amplifiers are with other functions as well even not acting as DC/AC
converter. One of them can be connected to external resistor to build a x10 amplify circuit. The reading from the
x10 signal into the ADC can still be of accuracy due to the excellent noise immunity of the amplifier.
FS9701B
5000 / 5
FS9704B
80000 / 5
Chart 1. FS970X A/B series chips
640 / 500 √ √ √ √ √ √ √ √ √ √ √ 5
640 / 800 √ √ √ √ √ √ √ √ √ √ √ 5
There are two different versions of FS970X with different specifications and functions. With the same micro
processor FSµP01 chip (programs), customers can easily and quickly develop different levels of DMM.
2. Features
2.1 General Features (FS9701A/B as an example)
1) Built-in high resolution ∆-Σ ADC
2) 5,000 counts, high-resolution low-speed input, 5 times / sec.
3) 500 counts, low resolution, high-speed input, 640 times / sec.
4) Built-in voltage regulator with 9V input, ±3.2V output
5) Under DC voltage, power consumption is under 1.2mA
6) Standby saving mode
7) Low battery detection
8) Good CMRR at 50/60HZ
9) Built-in crystal oscillator circuit
10) 2.5 kHz beeper driver
Rev. 4.2
5/47
5 Page 
FS970X
8. Regulator
VBAT
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VDD
VDDP
S81250
IN
OUT
VDDP
52
9V Battery
FS970x Regulator
53
REFH
ENGNDR_
32
VDD
VCC
20 uF
50
GNDR
AGND
20 uF
20 uF
Graph 1. FS970X Regulator Block-diagram
VSS
FS970X Regulator, as shown in Graph 1, needs to be connected with a S81250 low-cost regulator to convert
the battery voltage above 6.8V to VDD voltage of approx. 6.3V. There are two functions of VDD power: one is
the positive voltage (negative voltage to be VSSA) of analog circuit (or regulator), and the other is as the
reference voltage of regulators.
The power of the digital circuit in the chip is supplied by VCC. The digital signal ground is VSSD. The digital
signal ground VSSD and negative supply of analog circuit VSSA in the chip are connected by chip foundation of
thousand ohms.
As shown in Graph 1, the FS970X regulator circuit refers respectively to the voltage of VDDP and REFH; at the
same time, adjusting to the voltage of VCCR, GNDR and VSS to supply the chip. If VSS is set to be 0V, the
voltage of VCCR and GNDR will be 5V and 3.2V. This analog supply can directly supply AD737 to enable the
meter to measure the true root mean square of AC signal.
The supply source of FS970X can be selected by users, either from the chip itself or from external connection.
The analog supply within the chip is provided by VDDA, AGND and VSSA. Thus, directly feeding the output of
regulator VCCR, GNDR and VSS into VCC, AGND and VSSA will supply the chip itself. If the system has its
own supply, it can be connected directly to VCC, AGND and VSSA, instead of using VCCR and GNDR.
The power consumption of analog is static DC current, with an equivalent DC power consumption. The major
reason that will affect this DC power consumption is the change between each function. The power
consumption of FS970X analog parts is designed to be under 1.2mA and the digital parts under 0.5mA.
To be even more stringent on power consumption design under saving mode, connecting the chip’s analog
supply VDDA to VDDS will reduce the idle VDDA consumption to 0 under saving mode. For details about VDDS,
please see 5.3.
Rev. 4.2
11/47
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet FS9701B.PDF ] | |
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