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TS7001 Folha de dados(PDF) 9 Page - Silicon Laboratories

Nome de Peças TS7001
Descrição Electrónicos  A Micropower, 2-channel, 187.5-ksps, Serial-Output 12-bit SAR ADC
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Fabricante Electrônico  SILABS [Silicon Laboratories]
Página de início  http://www.silabs.com
Logo SILABS - Silicon Laboratories

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TS7001
TS7001 Rev. 1.0
Page 9
TS7001 CONTROL REGISTER DESCRIPTION
The TS7001’s write-only control register is 8-bits
wide. Serial ADC configuration data is uploaded
from the host processor at the TS7001’s DIN pin on
low-to-high SCLK transitions. Serial input data is
uploaded to the TS7001 simultaneously as the
conversion result is transferred out of the TS7001.
All serial data transfers require 16 serial clocks
transitions. After a high-to-low CS transition signal,
serial data available on the first eight low-to-high
SCLK transitions is transferred into the control
register. The first bit in the serial data stream is
always interpreted as the MSB. Upon initial power-
up, the TS7001’s default control register bit is
cleared to all zeros (all “0”s). Table 1 lists the
functions of the Control Register’s 8 bits.
Table 1. TS7001’s 8-Bit Control Register Content Description
DB7 (MSB)
DB6
DB5
DB4
DB3
DB2
DB1
DB0 (LSB)
DONTC
ZERO
REF
SIN/DUAL
CH
ZERO
PM1
PM0
DBx
Label
Comment
7
DONTC
Control Register DB7: Bit status of DB7 is “Don’t Care.” In other words, the DB7 bit can be a “0” or a “1”.
6
ZERO
Control Register DB6: To ensure correct TS7887 operation, Control Register DB6 status must always be a “zero”
(“0”).
5
REF
Control Register DB5 – Internal Voltage Reference Configuration: The status of DB5 determines whether the
TS7001’s internal voltage reference is enabled or disabled. A “0” in the DB5 location will enable the TS7001’s internal
voltage reference (default condition). To disable the TS7001’s internal voltage reference, a “1” must be written into
DB5’s register location.
4
SIN/DUAL
Control Register DB4 - Single-Channel/Dual-Channel Configuration. Control Register DB4 configures the TS7001 as
a single-channel or two-channel ADC. Loading a “zero” (“0”) into this register location configures the TS7001 for
single-channel operation with the AIN1/VREF pin configured to for internal VREF operation (default configuration). In
this case, the analog input signal range is 0V to VREF. Loading a “one” (“1”) into this register location configures the
TS7001 for two-channel operation with the AIN1/VREF pin configured to its AIN1 function as the second analog input.
In addition, the conversion process’s reference voltage is internally connected to VDD. In this case, the analog input
signal range is 0V to VDD. To obtain best performance from the TS7001 in two-channel operation, the ADC’s internal
reference should be disabled; that is, a “1” should be loaded into DB5’s register location.
3
CH
Control Register DB3 - Channel Select Bit: The bit status of DB3 determines on which channel the TS7001 is
converting. When the ADC is configured for dual-channel operation, DB3 determines which channel is converted on
the next conversion cycle. When DB3 is a “zero” (a “0”), the AIN0 input is selected and, when DB3 is a “one” (a “1”),
the AIN1 input is selected. DB3 should be a “zero” (“0”) when the TS7001 is configured for single-channel operation.
2
ZERO
Control Register DB2: To ensure correct TS7887 operation, Control Register DB2 status must always be a “zero”
(“0”).
1
PM1
Control Register DB1 and DB0 - Power Management Operating Modes: DB1 and DB0 are decoded to configure the
TS7001 into one of four operating modes as shown in Table 2.
0
PM0
Table 2. TS7001’s Power Management Operating Modes
PM1
PM0
Mode
0
0
PM Mode 1: In this operating mode, the TS7001’s power-down mode is enabled if its CS input is a “one” ( a “1”) and is
operating in full-power mode when its CS input is a “zero” (a “0”). Thus, the TS7001 is powered down on a low-to-high
CS transition and is powered up on a high-to-low CS transition.
0
1
PM Mode 2: In this operating mode and regardless of the status of any of the logic inputs, the TS7001 is always fully
powered up.
1
0
PM Mode 3: In this operating mode, the TS7001 is automatically powered down at the end of each conversion regardless
of the state of the CS input. ADC wake-up time from full shutdown is 5
μs and system design should ensure that at least
5
μs have elapsed before attempting to perform a conversion in this mode; otherwise, an invalid conversion result may
occur.
1
1
PM Mode 4: In this operating mode, the TS7001 is configured for standby operation after conversion. Sections of the
TS7001 are powered down; however, the internal 2.5-V reference voltage remains powered up. While PM Mode 4 is
similar to PM Mode 3, PM Mode 4 operation allows the TS7001 to power up much faster. For optimal performance, the
Control Register’s REF bit (DB5) should be a “zero” (“0”) to ensure the internal reference is enabled/remains enabled.


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