AR0135CS Datasheet, PDF (22/27 Pages) ON Semiconductor – 1/3‐inch 1.2 Mp CMOS Digital Image Sensor

AR0135CS
Power-Down Sequence
The recommended power-down sequence for the
AR0135CS is shown in Figure 20. The available power
supplies (V_DD_IO, V_DD, V_DD_SLVS, V_DD_PLL, V_AA,
V_AA_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 configuration, has
ended.
3. Turn off V_DD_SLVS.
4. Turn off V_DD.
5. Turn off V_DD_IO
6. Turn off V_AA/V_AA_PIX.
7. Turn off V_DD_PLL.
V_DD_SLVS (0.4)
V_DD (1.8)
V_DD_IO (1.8/2.8)
V_AA_PIX
V_AA (2.8)
V_DD_PLL (2.8)
EXTCLK
t₀
t₁
t₂
t₃
t₄
Power Down until Next
Power Up Cycle
Figure 20. Power Down
Table 19. POWER-DOWN SEQUENCE
Symbol
Parameter
Min
Typ
Max
Unit
t₀
V_DD_SLVS to V_DD
0
–
–
ms
t₁
V_DD to V_DD_IO
0
–
–
ms
t₂
V_DD_IO to V_AA/V_AA_PIX
0
–
–
ms
t₃
V_AA/V_AA_PIX to V_DD_PLL
0
–
–
ms
t₄
PwrDn until Next PwrUp Time
100
–
–
ms
1. t₄ is required between power down and next power up time; all decoupling caps from regulators must be completely discharged.
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