ZPSD211RM View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
ZPSD211RM Datasheet PDF : 51 Pages
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17.0
Calculating
Power
PSD211R Family
Once you have read the “Power Management” section, you should be able to calculate
power. The following is a sample power calculation:
Conditions
Part Used
MCU ALE Clock Frequency
Composite ZPLD input Frequency
% EPROM Access
= ZPSD211R (VCC = 5.0 V)
= 2.0 MHz
= 8.0 MHz (see example in above section)
= 80%
% I/O access
= 20%
% Time CSI is high (standby mode)
= 90%
% Time CSI is low (normal operation mode) = 10%
# Product terms used (see previous section) = 10
Turbo bit
= OFF (Turbo Mode disabled)
CMiser bit
= ON
MCU Bus Configuration
= 8-bit multiplexed bus mode
Calculation (Based on Typical AC and DC Currents)
ICC total = Istandby x % time CSI is high + [ICC (AC) + ICC (DC)] x % time CSI is low.
= Istandby x % time CSI is high +
[%EPROM Access x 0.8 mA/MHz x Freq. ALE
+ ZPLD AC current (Figure 13: 10 PTs, 8 MHz, Non-Turbo)]
x % time CSI is low.
= 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
NOTES: 1. Calculation is based on the assumption that Iout = 0 mA (no I/O pin loading).
2. ICC (DC) is zero for all ZPSD devices operating in non-turbo mode.
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.
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