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参数资料
| 型号： | TLC2558IPWR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | ADC |
| 英文描述： | 8-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20 |
| 封装： | GREEN, PLASTIC, TSSOP-20 |
| 文件页数： | 45/48页 |
| 文件大小： | 1072K |
| 代理商： | TLC2558IPWR |
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TLC2554, TLC2558
5-V, 12-BIT, 400 KSPS, 4/8 CHANNEL, LOW POWER,
SERIAL ANALOG-TO-DIGITAL CONVERTERS WITH AUTO POWER DOWN
SLAS220A –JUNE 1999
6
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
serial interface (continued)
The output data format is either binary (unipolar straight binary) or 2s complement.
binary
Zero scale code = 000h, Vcode = VREFM
Full scale code = FFFh, Vcode = VREFP – 1 LSB
2’s complement
Minus full scale code = 800h, Vcode = VREFM
Full scale code = 7FFh, Vcode = VREFP – 1 LSB
control and timing
start of the cycle:
D When FS is not used ( FS = 1 at the falling edge of CS), the falling edge of CS is the start of the cycle. Input
data is shifted in on the rising edge, and output data changes on the falling edge of SCLK. This is typically
used for a SPI microcontroller, although it can also be used for a DSP.
D When FS is used ( FS is an active signal from a DSP), the falling edge of FS is the start of the cycle. Input
data is shifted in on the falling edge, and output data changes on the rising edge of SCLK. This is typically
used for a TMS320 DSP.
first 4-MSBs: the command register (CMR)
The TLC2554/TLC2558 have a 4-bit command set (see Table 1) plus a 12-bit configuration data field. Most of
the commands require only the first 4 MSBs, i.e. without the 12-bit data field.
NOTE:
The device requires a write CFR (configuration register) with 000h data (write A000h to the serial
input) at power up to initialize host select mode.
The valid commands are listed in Table 1.
Table 1. TLC2554/TLC2558 Command Set
SDI D(15–12) BINARY, HEX
TLC2558 COMMAND
TLC2554 COMMAND
0000b
0000h
Select analog input channel 0
0001b
1000h
Select analog input channel 1
N/A
0010b
2000h
Select analog input channel 2
Select analog input channel 1
0011b
3000h
Select analog input channel 3
N/A
0100b
4000h
Select analog input channel 4
Select analog input channel 2
0101b
5000h
Select analog input channel 5
N/A
0110b
6000h
Select analog input channel 6
Select analog input channel 3
0111b
7000h
Select analog input channel 7
N/A
1000b
8000h
SW power down (analog + reference)
1001b
9000h
Read CFR register data shown as SDO D(11–0)
1010b
A000h plus data
Write CFR followed by 12-bit data
1011b
B000h
Select test, voltage = (REFP+REFM)/2
1100b
C000h
Select test, voltage = REFM
1101b
D000h
Select test, voltage = REFP
1110b
E000h
FIFO read, FIFO contents shown as SDO D(15–4), D(3–0) = 0000
1111b
F000h plus data
Reserved
1111b
F000h plus data
Reserved
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