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參數(shù)資料
| 型號(hào)： | ZPSD513B1 |
| 英文描述： | Field Programmable Microcontroller Peripherals(可編程邏輯，零功耗，16K位SRAM,40個(gè)可編程I/O,通用PLD有61個(gè)輸入) |
| 中文描述： | 現(xiàn)場(chǎng)可編程微控制器外圍設(shè)備（可編程邏輯，零功耗，16K的位的SRAM，40余個(gè)可編程輸入/輸出，通用PLD的有61個(gè)輸入） |
| 文件頁(yè)數(shù)： | 3/142頁(yè) |
| 文件大?。?/td> | 786K |
| 代理商： | ZPSD513B1 |
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ZPSD5XX Famly
7-3
Upon each address or logic input change to the ZPSD, the device powers up from low
power standby for a short time. Then the ZPSD consumes only the necessary power to
deliver new logic or memory data to its outputs as a response to the input change. After the
new outputs are stable, the ZPSD latches them and automatically reverts back to standby
mode. The I
CC
current flowing during standby mode and during DC operation is identical
and is only a few microamperes.
The ZPSD automatically reduces its DC current drain to these low levels and does not
require controlling by the CSI (Chip Select) input. Disabling the CSI pin unconditionally
forces the ZPSD to standby mode independent of other input transitions.
The only significant power consumption in the ZPSD occurs during AC operation.
The ZPSD contains the first architecture to apply zero power techniques to memory circuit
blocks as well as logic.
Figure 1 compares ZPSD zero power operation to the operation of a discrete solution.
A standard microcontroller (MCU) bus cycle usually starts with an ALE (or AS) pulse and
the generation of an address. The ZPSD detects the address transition and powers up for a
short time. The ZPSD then latches the outputs of the PAD, EPROM and SRAM to the new
values. After finishing these operations, the ZPSD shuts off its internal power, entering
standby mode. The time taken for the entire cycle is less than the ZPSD’s “access time.”
The ZPSD will stay in standby mode if the address does not change between bus cycles
(for example, looping on a single address or a Halt operation). In an alternate system
implementation using discrete EPROM, SRAM and other discrete components, the system
will consume operating power during the entire bus cycle. This is because the chip select
inputs on the memory devices are usually active throughout the entire cycle. The AC power
consumption of the ZPSD may be calculated using the ALE frequency.
Integrated
Power
Management
Operation
TM
ALE
DISCRETE EPROM, SRAM & LOGIC
ADDRESS
EPROM
ACCESS
SRAM
ACCESS
EPROM
ACCESS
I
CC
ZPSD
ZPSD
ZPSD
TIME
Figure 1.
ZPSDPower
Operation
vs.
Dscrete
Implementation
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