XE8000EV121 Semtech, XE8000EV121 Datasheet - Page 39

• Manufacturer Part Number: XE8000EV121
• Description: BOARD EVAL FOR SX8723/24
• Manufacturer: Semtech

Specifications of XE8000EV121

• Main Purpose: Interface, Sensor to ADC Interface, Programmable
• Embedded: No
• Utilized Ic / Part: SX8723, SX8724, SX8725
• Primary Attributes: Signal Conditioning for Bridge-Type Sensors
• Secondary Attributes: GUI, Up to 16-Bit, Programmable Gain of 1/12 ~ 1000, I2C Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADVANCED COMMUNICATIONS & SENSING
Power Reduction
The ZoomingADC is particularly well suited for low-power applications. When very low power consumption is
of primary concern, such as in battery operated systems, several parameters can be used to reduce power
consumption as follows:
Finally, remember that power reduction is typically traded off with reduced linearity, larger noise and slower
maximum sampling speed.
Recommended Design for Other 2-WIRE Devices Connection
SX8725 does not support multiple devices on the same 2-WIRE bus. A separate 2-WIRE bus should be used to
address other devices as seen on the following schematic.
V1.8 © 2009 Semtech Corp.
1. Operate the acquisition chain with a reduced supply voltage VDD.
2. Disable the PGAs which are not used during analog-to-digital conversion with ENABLE[3:0].
3. Disable all PGAs and the ADC when the system is idle and no conversion is performed.
4. Use lower bias currents in the PGAs and the ADC using the control words IB_AMP_PGA[1:0] and
5. Reduce sampling frequency.
IB_AMP_ADC[1:0].
AC2
AC3
Figure 22 - Recommended connections with other devices
D0 D1
SX8725
ZoomingADC™ for Pressure and Temperature Sensing
VBATT
VPUMP
VSS
READY
SCL
SDA
39
SCL1
SDA1
GND
VCC
GND
VCC
A0
A1
A2
I2C 1
EEPROM
(or other
devices)
I2C 2
uC
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SX8725