zpsd211r STMicroelectronics, zpsd211r Datasheet - Page 30

• Manufacturer Part Number: zpsd211r
• Description: Low Cost Field Programmable Microcontroller Peripherals
• Manufacturer: STMicroelectronics

17.0
Calculating
Power
Once you have read the “Power Management” section, you should be able to calculate
power. The following is a sample power calculation:
NOTES: 1. Calculation is based on the assumption that Iout = 0 mA (no I/O pin loading).
Conditions
Part Used
MCU ALE Clock Frequency
Composite ZPLD input Frequency
% EPROM Access
% I/O access
% Time CSI is high (standby mode)
% Time CSI is low (normal operation mode) = 10%
# Product terms used (see previous section) = 10
Turbo bit
CMiser bit
MCU Bus Configuration
Calculation (Based on Typical AC and DC Currents)
I
CC
total = Istandby x % time CSI is high +
2. I
3. 10 product terms: 8 for EPROM, 1 for CSIOPORT, 1 for CS8
4. The 5% I/O access in the conditions section is when the MCU accesses CSIOPORT space.
5. Standby Mode can also be achieved without using the CSI pin. The ZPSD device will automatically
go into Standby while no inputs are changing on any pin, and Turbo Mode is disabled.
CC
= Istandby x % time CSI is high +
= 10 µA x 0.9 + (0.8 x 0.8 mA/MHz x 2 MHz + 5.0 mA) x 0.1
= 9.0 µA + (1.28 mA + 5.0 mA) x 0.1
= 637 µA, based on the system operating in standby 90% of the time
(DC) is zero for all ZPSD devices operating in non-turbo mode.
[
+ ZPLD AC current (Figure 13: 10 PTs, 8 MHz, Non-Turbo)
x % time CSI is low.
%EPROM Access x 0.8 mA/MHz x Freq. ALE
[
I
= ZPSD211R (V
= 2.0 MHz
= 8.0 MHz (see example in above section)
= 80%
= 20%
= 90%
= OFF (Turbo Mode disabled)
= ON
= 8-bit multiplexed bus mode
CC
(AC) + I
CC
(DC)
CC
]
x % time CSI is low.
= 5.0 V)
PSD211R Family
]
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