Datasheet

START A CONVERTER FUNCTION (CONTROL BYTE 1)
ControlByte1Write
CS
( )SS
SCLK
SDI
(MOSI)
D7 D3D5 D4 D2
D6
D0D1
MSB LSB
1
1
65432 87
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www.ti.com ......................................................................................................................................................... SBAS415C – JUNE 2007 – REVISED MARCH 2009
Table 10. Internal Register Map
REGISTER ADDRESS
A3 A2 A1 A0 REGISTER CONTENT READ/WRITE
0 0 0 0 X measurement result R
0 0 0 1 Y measurement result R
0 0 1 0 Z
1
measurement result R
0 0 1 1 Z
2
measurement result R
0 1 0 0 AUX measurement result R
0 1 0 1 Temp1 measurement result R
0 1 1 0 Temp2 measurement result R
0 1 1 1 Status R
1 0 0 0 AUX high threshold R/W
1 0 0 1 AUX low threshold R/W
1 0 1 0 Temp high threshold (apply to both TEMP1 and TEMP2) R/W
1 0 1 1 Temp low threshold (apply to both TEMP1 and TEMP2) R/W
1 1 0 0 CFR0 R/W
1 1 0 1 CFR1 R/W
1 1 1 0 CFR2 R/W
1 1 1 1 Converter function select status R
R/ W— Register read and write control. A '1' indicates the contents of the internal register addressed by A3-A0 are
sent to SDO at the next SPI interface clock cycle. A '0' indicates the data following Control Byte 0 on SDI are
written into registers addressed by A3-A0.
Control Byte 1 must begin with D7 = 1, as shown in Figure 31 . Control Byte 1 starts the converter function that is
chosen by C3-C0, as shown in Table 7 . After sending Control Byte 1, the master does not need to hold CS low,
and can release CS for operating other slave devices that share the same SCLK. After the converter function
completes or stops, the preprocessed data or data set are stored in data registers and can be read by sending
Control Byte 0 with Read Bit and a proper address in A3-A0. For the detailed operating procedures, see the
Operation section.
Figure 31. Interface Timing — Control Byte 1
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