PSD211R datasheet(30/51 Pages) STMICROELECTRONICS

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PSD211R Family

17.0

Calculating

Power

Conditions

Part Used

= ZPSD211R (VCC = 5.0 V)

MCU ALE Clock Frequency

= 2.0 MHz

Composite ZPLD input Frequency

= 8.0 MHz (see example in above section)

% EPROM Access

= 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

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).

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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