When a power-down transition or power irregularity causes VDD
參數(shù)資料
型號(hào)： CP2201EK
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 42/108頁(yè)
文件大?。?/td> 0K
描述： KIT EVAL FOR CP2201 ETH CTRLR
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，以太網(wǎng)傳感器
嵌入式： 是，MCU，8 位
已用 IC / 零件： CP2200，CP2201
主要屬性： 溫度和光傳感器
次要屬性： 圖形用戶界面
已供物品： 板，電源，線纜，CD
產(chǎn)品目錄頁(yè)面： 627 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： 336-1313-ND - IC ETH CTRLR SNGL-CHIP 28QFN
336-1312-ND - IC ETH CTRLR SNGL-CHIP 48TQFP
其它名稱： 336-1316
CP2200/1
Rev. 1.0
39
9.2. Power-fail
When a power-down transition or power irregularity causes VDD to drop below VRST, the power supply monitor will
drive the /RST pin low and return the CP2200/1 to the reset state. When VDD returns to a level above VRST, the
CP2200/1 will be released from the reset state as shown in Figure 14.
The power supply monitor circuit (VDD Monitor) is enabled and selected as a reset source by hardware following
every power-on reset. To prevent the device from being held in reset when VDD drops below VRST, the VDD Monitor
may be deselected as a reset source (see RSTEN on page 42) and disabled (see VDMCN on page 39). It is
recommended to leave the VDD Monitor enabled and selected as a reset source at all times.
Register 11. VDMCN: VDD Monitor Control Register
9.3. Oscillator-Fail Reset
If the system clock derived from the oscillator fails for any reason after oscillator initialization is complete, the reset
circuitry will drive the /RST pin low and return the CP2200/1 to the reset state. The CP2200/1 will remain in the
reset state for approximately 1 ms then exit the reset state in the same manner as that for the power-on reset.
9.4. External Pin Reset
The external /RST pin provides a means for external circuitry to force the CP2200/1 into a reset state. Asserting the
/RST pin low will cause the CP2200/1 to enter the reset state. It is recommended to provide an external pull-up
and/or decoupling capacitor of the /RST pin to avoid erroneous noise-induced resets. The CP2200/1 will exit the
reset state approximately 4 s after a logic high is detected on /RST.
Bit 7:
VDMEN: VDD Monitor Enable
This bit can be used to disable or enable the VDD Monitor Circuit. Note: The VDD Monitor circuit is
enabled and selected as a reset source following every power-on reset. If the VDD Monitor is
disabled and then reenabled during device operation, it must be allowed to stabilize before it is
selected as a reset source. Selecting the VDD Monitor as a reset source before it has stabilized will
generate a system reset. See Table 13 on page 42 for the minimum VDD Monitor turn-on time.
0: VDD Monitor Disabled.
1: VDD Monitor Enabled.
Bit6:
VDDSTAT: VDD Status
This bit indicates the current power supply status (VDD Monitor output).
0: VDD voltage is at or below the VDD Monitor threshold.
1: VDD voltage is above the VDD Monitor threshold.
Bits 5–0: RESERVED. Read = varies; Write = don’t care.
R/W
R
RRR
RR
Reset Value
VDMEN
VDDSTAT Reserved Reserved Reserved Reserved Reserved Reserved 00000000
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
Address:
0x13
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