AR0237CS Datasheet, PDF (35/38 Pages) ON Semiconductor – 1/2.7-Inch 2.1 Mp/Full HD Digital Image Sensor

AR0237CS: 1/2.7-Inch 2.1 Mp/Full HD Digital Image Sensor
Power-On Reset and Standby Timing
Power-Down Sequence
The recommended power-down sequence for the AR0237 is shown in Figure 16. The
available power supplies (VDD_IO, VDD, VDD_SLVS, VDD_PLL, VAA, VAA_PIX) must have
the separation specified below.
1. Disable streaming if output is active by setting standby R0x301a[2] = 0
2. The soft standby state is reached after the current row or frame, depending on config-
uration, has ended.
3. Turn off VDD_SLVS.
4. Turn off VDD.
5. Turn off VDD_IO.
6. Turn off VAA/VAA_PIX.
7. Turn off VDD_PLL.
Figure 16: Power Down
VDD_SLVS (0.4)
VDD (1.8)
V DD_IO (1.8/2.8)
VAA_PIX
VAA (2.8)
VDD_PLL (2.8)
t0
t1
t2
t3
EXTCLK
t4
Power Down until next Power up cycle
Table 19:
Power-Down Sequence
Definition
VDD_SLVS to VDD
VDD to VDD_IO
VDD_IO to VAA/VAA_PIX
VAA/VAA_PIX to VDD_PLL
Power Down until Next Power Up Time
Symbol
t0
t1
t2
t3
t4
Minimum
0
0
0
0
100
Typical Maximum Unit
–
–
s
–
–
s
–
–
s
–
–
s
–
–
ms
t4 is required between power down and next power up time; all decoupling caps from
regulators must be completely discharged.
AR0237CS/D Rev. 4, 6/16 EN
35
©Semiconductor Components Industries, LLC, 2016.