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20
FN3612.10
June 27, 2006
Control Register
The Control Register contains 24-bits to control the various
sections of the HI7190. This register is a read/write
register.
DC - Bit 23 is the Data Coding Bit used to select between
two’s complementary and offset binary data coding. When
this bit is set (DC = 1) the data in the Data Output Register
will be two’s complement. When cleared (DC = 0) this data
will be offset binary. When operating in the unipolar mode
the output data is available in straight binary only (the DC bit
is ignored). This bit is cleared after a RESET is applied to the
part.
FP10 through FP0 - Bits 22 through 12 are the Filter
programming bits that determine the frequency response of
the digital filter. These bits determine the filter cutoff
frequency, the position of the first notch and the data rate of
the HI7190. The first notch of the filter is equal to the
decimation rate and can be determined by the formula:
fNOTCH = fOSC /(512 x CODE)
where CODE is the decimal equivalent of the value in FP10
through FP0. The values that can be programmed into these
bits are 10 to 2047 decimal, which allows a conversion rate
range of 9.54Hz to 1.953kHz when using a 10MHz clock.
IR WRITE PHASE
DATA TRANSFER PHASE - TWO-BYTE READ
CS
SCLK
SDIO
SDO
I0
I1
I2
I3
I4
I5
I6
I7
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10 B11 B12 B13 B14
B15
FIGURE 17. DATA READ CYCLE, 3-WIRE CONFIGURATION, SCLK IDLE HIGH
THREE-STATE
IR WRITE PHASE
DATA TRANSFER PHASE - TWO-BYTE READ
CS
SCLK
SDIO
SDO
I0
I1
I2
I3
I4
I5
I6
I7
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9
B10 B11 B12 B13 B14
B15
FIGURE 18. DATA READ CYCLE, 2-WIRE CONFIGURATION, SCLK IDLE LOW
THREE-STATE
IR WRITE PHASE
DATA TRANSFER PHASE - TWO-BYTE READ
CS
SCLK
SDIO
SDO
I0
I1
I2
I3
I4
I5
I6
I7
B0
B1
B2
B3
B4
B5
B6
B7
B8
B9 B10 B11 B12 B13 B14
B15
FIGURE 19. DATA READ CYCLE, 2-WIRE CONFIGURATION, SCLK IDLE HIGH
BYTE 2
MSB
22212019181716
DC
FP10
FP9
FP8
FP7
FP6
FP5
FP4
BYTE 1
15
14
13
12
11
10
9
8
FP3
FP2
FP1
FP0
MD2
MD1
MD0
B/U
BYTE 0
7654321
LSB
G2
G1
G0
BO
SB
BD
MSB
SDL
HI7190
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HI7191IBZ-T 功能描述:模数转换器 - ADC ADC 24BIT SIGMADELTA 20 IND RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32
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