PSD312 datasheet(37/85 Pages) STMICROELECTRONICS

37 / 85 page

PSD3XX Family

Conditions

Part Used

= ZPSD3XX (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%

% SRAM Access

= 15%

% I/O access

= 5%

%Time CSI is high (standby mode)

= 90%

%Time CSI is low (normal operation mode)

= 10%

# Product terms used (see previous section) = 13 (13/40 = 33%)

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. of ALE

+ % SRAM x 1.4 mA/MHz x Freq of ALE

+ ZPLD AC current (Figure 14: 13 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 + 0.15 x 1.4 mA/MHz x 2 MHz

+ 5.0 mA) x 0.1

= 9.0 µA + (1.28 mA + 0.42 mA + 5.0 mA) x 0.1

= 679 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:

17.

Calculating

Power

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. 13 product terms: 8 for EPROM, 3 for Chip Selects, 1 for SRAM, 1 for CSIOPORT.

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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