AR0134CS_16 Datasheet, PDF (31/38 Pages) ON Semiconductor – 1/3-Inch 1.2 Mp CMOS Digital Image Sensor

AR0134CS: 1/3-Inch 1.2 Mp CMOS Digital Image Sensor
Power-On Reset and Standby Timing
3. It is critical that VDD_PLL is not powered up after the other power supplies. It must be powered
before or at least at the same time as the others. If the case happens that VDD_PLL is powered after
other supplies then the sensor may have functionality issues and will experience high current draw
on this supply.
Power-Down Sequence
The recommended power-down sequence for the AR0134 is shown in Figure 20. 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 20: 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
Symbol Minimum Typical Maximum Unit
VDD_SLVS to VDD
t0
0
–
–
S
VDD to VDD_IO
t1
0
–
–
S
VDD_IO to VAA/VAA_PIX
t2
0
–
–
S
VAA/VAA_PIX to VDD_PLL
t3
0
–
–
S
PwrDn until Next PwrUp Time
t4
100
–
–
mS
AR0134CS/D Rev. 8, Pub. 1/16 EN
31
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