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參數(shù)資料
| 型號： | LTC2428C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2.5-V to 3.3-V/3.3-V To 5-V Level Shifting Transceiver With 3-State Outputs 56-BGA MICROSTAR JUNIOR -40 to 85 |
| 中文描述： | 4-/8-Channel 20位ADC的無延遲uPower |
| 文件頁數(shù)： | 16/28頁 |
| 文件大?。?/td> | 317K |
| 代理商： | LTC2428C |
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16
LTC2424/LTC2428
APPLICATIO
S I
FOR
ATIO
U
In addition, the CSADC signal can be used to trigger a new
conversion cycle before the entire serial data transfer has
been completed. The LTC2424/LTC2428 will abort any
serial data transfer in progress and start a new conversion
cycle anytime a LOW-to-HIGH transition is detected at the
CSADC pin after the converter has entered the data output
state (i.e., after the first rising edge of SCK occurs with
CSADC = 0).
W
U
U
Multiplexer Chip Select (CSMUX)
For 4-wire operation, this pin is tied directly to CSADC or
the output of an inverter tied to CSADC. CSMUX (Pin 20)
is driven HIGH during selection of a multiplexer channel.
On the falling edge of CSMUX, the selected channel is
enabled and drives MUXOUT.
Data Input (D
IN
)
The data input to the multiplexer, D
IN
(Pin 21), is used to
program the multiplexer. The input channel is selected by
serially shifting a 4-bit input word into the D
IN
pin under
the control of the multiplexer clock, CLK. Data is shifted
into the multiplexer on the rising edge of CLK. Table 3
shows the logic table for channel selection. In order to
select or change a previously programmed channel, an
enable bit (D
IN
= 1) must proceed the 3-bit channel select
serial data. The user may set D
IN
= 0 to continually convert
on the previously selected channel.
SERIAL INTERFACE TIMING MODES
The LTC2424/LTC2428’s 4-wire interface is SPI and
MICROWIRE compatible. This interface offers two modes
of operation. These include an internal or external serial
clock. The following sections describe both of these serial
interface timing modes in detail. For both cases the
converter can use the internal oscillator (F
O
= LOW or F
O
= HIGH) or an external oscillator connected to the F
O
pin.
Refer to Table 5 for a summary.
External Serial Clock (SPI/MICROWIRE Compatible)
This timing mode uses an external serial clock (SCK) to
shift out the conversion result, see Figure 13. This same
external clock signal drives the CLK pin in order to pro-
gram the multiplexer. A single CS signal drives both the
multiplexer CSMUX and converter CSADC inputs. This
common signal is used to monitor and control the state of
the conversion as well as enable the channel selection.
The serial clock mode is selected on the falling edge of
CSADC. To select the external serial clock mode, the serial
clock pin (SCK) must be LOW during each CSADC falling
edge.
The serial data output pin (SDO) is HI-Z as long as CSADC
is HIGH. At any time during the conversion cycle, CSADC
may be pulled LOW in order to monitor the state of the
converter. While CSADC is LOW, EOC is output to the SDO
pin. EOC = 1 while a conversion is in progress and EOC =
0 if the device is in the sleep state. Independent of CSADC,
the device automatically enters the low power sleep state
once the conversion is complete.
While the device is in the sleep state, prior to entering the
data output state, the user may program the multiplexer.
As shown in Figure 13, the multiplexer channel is selected
by serial shifting a 4-bit word into the D
IN
pin on the rising
edge of CLK (CLK is tied to SCK). The first bit is an enable
bit that must be HIGH in order to program a channel. The
next three bits determine which channel is selected, see
Table 3. On the falling edge of CSMUX, the new channel is
selected and will be valid for the first conversion performed
following the data output state. Clock signals applied to the
CLK pin while CSMUX is LOW (during the data output
state) will have no effect on the channel selection. Further-
more, if D
IN
is held LOW or CLK is held LOW during the
sleep state, the channel selection is unchanged.
When the device is in the sleep state (EOC = 0), its
conversion result is held in an internal static shift regis
ter.
Table 5. LTC2424/LTC2428 Interface Timing Modes
Conversion
Cycle
Control
CSADC and SCK
CSADC
↓
Data
Output
Control
Connection
and
Waveforms
Figures 7, 8, 9
Figures 10, 11
SCK
Source
External
Internal
Configuration
External SCK
Internal SCK
CSADC and SCK
CSADC
↓
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