參數(shù)資料
型號(hào)： AD5750-1BCPZ-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 19/36頁(yè)
文件大?。?/td> 0K
描述： IC CURR/VOLT OUT DVR 32LFCSP
標(biāo)準(zhǔn)包裝： 1,500
放大器類型： 儀表
電路數(shù)： 1
轉(zhuǎn)換速率： 2 V/µs
電流 - 電源： 5.2mA
電流 - 輸出 / 通道： 24mA
電壓 - 電源，單路/雙路(±)： ±10.8 V ~ 26.4 V
工作溫度： -40°C ~ 105°C
安裝類型： 表面貼裝
封裝/外殼： 32-LFCSP
供應(yīng)商設(shè)備封裝： 32-LFCSP-VQ
包裝： 帶卷 (TR)
AD5750/AD5750-1
Rev. C | Page 26 of 36
DEFAULT REGISTERS AT POWER-ON
The AD5750/AD5750-1 power-on reset circuit ensures that all
registers are loaded with zero code.
In software SPI mode, the part powers up with all outputs
disabled (OUTEN bit = 0). The user must set the OUTEN bit in
the control register to enable the output and, in the same write,
set the output range configuration using the R3 to R0 bits.
If hardware mode is selected, the part powers up to the
conditions defined by the R3 to R0 bits and the status of the
OUTEN pin. It is recommended to keep the output disabled
when powering up the part in hardware mode.
RESET FUNCTION
In software mode, the part can be reset using the RESET pin
(active low) or the reset bit (reset = 1). A reset disables both the
current and voltage outputs to their power-on condition. The
user must write to the OUTEN bit to enable the output and, in
the same write, set the output range configuration. The RESET
pin is a level-sensitive input; the part stays in reset mode as long
as the RESET pin is low. The reset bit clears to 0 following a
reset command to the control register.
In hardware mode, there is no reset. If using the part in hardware
mode, the RESET pin should be tied high.
OUTEN
In software mode, the output can be enabled or disabled using
the OUTEN bit in the control register. When the output is
disabled, both the current and voltage channels go into tristate.
The user must set the OUTEN bit to enable the output and
simultaneously set the output range configuration.
In hardware mode, the output can be enabled or disabled using
the OUTEN pin. When the output is disabled, both the current
and voltage channels go into tristate. The user must write to the
OUTEN pin to enable the output. It is recommended that the
output be disabled when changing the ranges.
SOFTWARE CONTROL
Software control is enabled by connecting the HW SELECT
pin to ground. In software mode, the AD5750/AD5750-1 are
controlled over a versatile 3-wire serial interface that operates
at clock rates up to 50 MHz. It is compatible with SPI, QSPI,
MICROWIRE, and DSP standards.
Input Shift Register
The input shift register is 16 bits wide. Data is loaded into the
device MSB first as a 16-bit word under the control of a serial
clock input, SCLK. Data is clocked in on the falling edge of
SCLK. The input shift register consists of 16 control bits, as shown
in Table 7. The timing diagram for this write operation is shown
in Figure 2. The first three bits of the input shift register are used
to set the hardware address of the AD5750/AD5750-1 device on
the printed circuit board (PCB). Up to eight devices can be
addressed per board.
Bit D11, Bit D1, and Bit D0 must always be set to 0 during any
write sequence.
Table 7. Input Shift Register Contents for a Write Operation—Control Register
MSB
LSB
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
A2
A1
A0
R/W
0
R3
R2
R1
R0
CLRSEL
OUTEN
Clear
RSET
Reset
0
Table 8. Input Shift Register Descriptions
Bit
Description
A2, A1, A0
Used in association with the AD2, AD1, and AD0 external pins to determine which part is being addressed by the system
controller.
A2
A1
A0
Function
0
Addresses part with Pin AD2 = 0, Pin AD1 = 0, Pin AD0 = 0.
0
1
Addresses part with Pin AD2 = 0, Pin AD1 = 0, Pin AD0 = 1.
0
1
0
Addresses part with Pin AD2 = 0, Pin AD1 = 1, Pin AD0 = 0.
0
1
Addresses part with Pin AD2 = 0, Pin AD1 = 1, Pin AD0 = 1.
1
0
Addresses part with Pin AD2 = 1, Pin AD1 = 0, Pin AD0 = 0.
1
0
1
Addresses part with Pin AD2 = 1, Pin AD1 = 0, Pin AD0 = 1.
1
0
Addresses part with Pin AD2 = 1, Pin AD1 = 1, Pin AD0 = 0.
1
Addresses part with Pin AD2 = 1, Pin AD1 = 1, Pin AD0 = 1.
R/W
Indicates a read from or a write to the addressed register.
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