ADC3221 Datasheet, PDF (50/77 Pages) Texas Instruments – Dual Channel

ADC3221, ADC3222, ADC3223, ADC3224
SBAS672B – JULY 2014 – REVISED MARCH 2016
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Programming (continued)
9.5.1.1 Register Initialization
After power-up, the internal registers must be initialized to their default values through a hardware reset by
applying a high pulse on the RESET pin (of durations greater than 10 ns), as shown in Figure 143. If required,
the serial interface registers can be cleared during operation either:
1. Through a hardware reset, or
2. By applying a software reset. When using the serial interface, set the RESET bit (D0 in register address 06h)
high. This setting initializes the internal registers to the default values and then self-resets the RESET bit low.
In this case, the RESET pin is kept low.
9.5.1.1.1 Serial Register Write
The device internal register can be programmed with these steps:
1. Drive the SEN pin low,
2. Set the R/W bit to 0 (bit A15 of the 16-bit address),
3. Set bit A14 in the address field to 1,
4. Initiate a serial interface cycle by specifying the address of the register (A13 to A0) whose content must be
written, and
5. Write the 8-bit data that are latched in on the SCLK rising edge.
Figure 143 and Table 6 show the timing requirements for the serial register write operation.
Register Address [13:0]
Register Data [7:0]
SDATA
R/W 1
=0
A13 A12 A11
A1 A0 D7 D6 D5 D4 D3 D2 D1 D0
t_SCLK
t_DH
t_DSU
SCLK
SEN
t_SLOADS
t_SLOADH
RESET
Figure 143. Serial Register Write Timing Diagram
Table 6. Serial Interface Timing⁽¹⁾
f_SCLK
t_SLOADS
t_SLOADH
t_DSU
t_DH
SCLK frequency (equal to 1 / t_SCLK)
SEN to SCLK setup time
SCLK to SEN hold time
SDIO setup time
SDIO hold time
MIN
TYP
MAX
UNIT
> dc
20
MHz
25
ns
25
ns
25
ns
25
ns
(1) Typical values are at 25°C, full temperature range is from T_MIN = –40°C to T_MAX = 85°C, and AVDD = DVDD = 1.8 V, unless otherwise
noted.
50
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