参数资料
| 型号： | AD5735ACPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 30/48页 |
| 文件大小： | 0K |
| 描述： | IC DAC QUAD VOLT CUR 64-LFCSP |
| 标准包装： | 1 |
| 设置时间： | 18µs |
| 位数： | 12 |
| 数据接口： | DSP，MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 4 |
| 电压电源： | 模拟和数字，双 ± |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 64-LFCSP-VQ（9x9） |
| 包装： | 托盘 |
| 输出数目和类型： | 4 电流，4 电压 |
| 采样率（每秒）： | * |
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AD5735
Data Sheet
Rev. C | Page 36 of 48
Software Register
The software register allows the user to perform a software reset of
the part. This register is also used to set the user toggle bit, D11,
in the status register and as part of the watchdog timer feature
when that feature is enabled.
Bit D12 in the software register can be used to ensure that
communication has not been lost between the MCU and the
AD5735 and that the datapath lines are working properly (that
is, SDIN, SCLK, and SYNC).
When the watchdog timer feature is enabled, the user must write
0x195 to Bits[D11:D0] of the software register within the timeout
period. If this command is not received within the timeout period,
the ALERT pin signals a fault condition. This command is only
required when the watchdog timer feature is enabled.
DC-to-DC Control Register
The dc-to-dc control register allows the user to configure the
dc-to-dc switching frequency and phase, as well as the maxi-
mum allowable dc-to-dc output voltage. The dc-to-dc control
register options are shown in Table 27 and Table 28.
Table 25. Programming the Software Register
D15
D14
D13
D12
D11 to D0
1
0
User program
Reset code/SPI code
Table 26. Software Register Bit Descriptions
Bit Name
Description
User Program
This bit is mapped to Bit D11 of the status register. When this bit is set to 1, Bit D11 of the status register is set to 1.
When this bit is set to 0, Bit D11 of the status register is also set to 0. This feature can be used to ensure that the SPI
pins are working correctly by writing a known bit value to this register and then reading back Bit D11 from the
status register.
Reset Code/SPI Code
Option
Description
Reset code
Writing 0x555 to Bits[D11:D0] performs a software reset of the AD5735.
SPI code
If the watchdog timer feature is enabled, 0x195 must be written to the software register
(Bits[D11:D0]) within the programmed timeout period (see Table 22).
Table 27. Programming the DC-to-DC Control Register
D15
D14
D13
D12 to D7
D6
D5 to D4
D3 to D2
D1 to D0
0
1
X1
DC-DC comp
DC-DC phase
DC-DC freq
DC-DC MaxV
1 X = don’t care.
Table 28. DC-to-DC Control Register Bit Descriptions
Bit Name
Description
DC-DC Comp
Selects the internal compensation resistor or an external compensation resistor for the dc-to-dc converter. See the
0 = selects the internal 150 k compensation resistor (default).
1 = bypasses the internal compensation resistor. When this bit is set to 1, an external compensation resistor must
be used; this resistor is placed at the COMP
DCDC_x pin in series with the 10 nF dc-to-dc compensation capacitor to
ground. Typically, a resistor of ~50 k is recommended.
DC-DC Phase
User-programmable dc-to-dc converter phase (between channels).
00 = all dc-to-dc converters clock on the same edge (default).
01 = Channel A and Channel B clock on the same edge; Channel C and Channel D clock on the opposite edge.
10 = Channel A and Channel C clock on the same edge; Channel B and Channel D clock on the opposite edge.
11 = Channel A, Channel B, Channel C, and Channel D clock 90° out of phase from each other.
DC-DC Freq
Switching frequency for the dc-to-dc converter; this frequency is divided down from the internal 13 MHz oscillator
00 = 250 kHz ± 10%.
01 = 410 kHz ± 10% (default).
10 = 650 kHz ± 10%.
DC-DC MaxV
Maximum allowed V
BOOST_x voltage supplied by the dc-to-dc converter.
00 = 23 V + 1 V/1.5 V (default).
01 = 24.5 V ± 1 V.
10 = 27 V ± 1 V.
11 = 29.5 V ± 1 V.
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