Silicon Laboratories C8051F347 - Manual (Page 26)

C8051F340/1/2/3/4/5/6/7/8/9/A/B/C/D
26 Rev. 1.3
Other electrical characteristics tables are found in the data sheet section corresponding to the associated
peripherals. For more information on electrical characteristics for a specific peripheral, refer to the page
indicated in Table 3.2.
I
DD
Frequency Sensitivity
3,6 V
DD
= 3.3 V, SYSCLK < 1 MHz,

T = 25 ºC
V
DD
= 3.3 V, SYSCLK > 1 MHz,

T = 25 ºC
V
DD
= 3.6 V, SYSCLK < 1 MHz,

T = 25 ºC
V
DD
= 3.6 V, SYSCLK > 1 MHz,

T = 25 ºC
0.44
0.32
0.49
0.36
mA/MHz
mA/MHz
mA/MHz
mA/MHz
Digital Supply Current (Stop
Mode, shutdown) Oscillator not running,

V
DD
monitor disabled
< 0.1 µA
Digital Supply Current for USB
Module (USB Active Mode) V
DD
= 3.3 V, USB Clock = 48 MHz
V
DD
= 3.6 V, USB Clock = 48 MHz
8.69
9.59
mA
mA
Digital Supply Current for USB
Module (USB Suspend Mode) Oscillator not running

V
DD
monitor disabled
< 0.1 µA
Notes:
1. USB Requires 3.0 V Minimum Supply Voltage.
2. SYSCLK must be at least 32 kHz to enable debugging.
3. Based on device characterization of data; Not production tested.
4. Active and Inactive I
DD
at voltages and frequencies other than those specified can be calculated using the I
DD
Supply Sensitivity. For example, if the V
DD
is 3.0 V instead of 3.3 V at 24 MHz: I
DD
= 13.9 mA typical at 3.3 V
and SYSCLK = 24 MHz. From this, I
DD
= 13.9 mA + 0.46 x (3.0 V – 3.3 V) = 13.76 mA at 3.0 V and SYSCLK
= 24 MHz.
5. I
DD
can be estimated for frequencies < 30 MHz by multiplying the frequency of interest by the frequency
sensitivity number for that range. When using these numbers to estimate I
DD
for > 30 MHz, the estimate should
be the current at 24 MHz (or 48 MHz) minus the difference in current indicated by the frequency sensitivity
number. For example: V
DD
= 3.3 V; SYSCLK = 35 MHz, I
DD
= 13.9 mA – (24 MHz – 35 MHz) x 0.44 mA/MHz =
18.74 mA.
6. Idle I
DD
can be estimated for frequencies < 1 MHz by multiplying the frequency of interest by the frequency
sensitivity number for that range. When using these numbers to estimate Idle I
DD
for > 1 MHz, the estimate
should be the current at 24 MHz (or 48 MHz) minus the difference in current indicated by the frequency
sensitivity number. For example: V
DD
= 3.3 V; SYSCLK = 5 MHz, Idle I
DD
= 8.25 mA – (24 MHz – 5 MHz) x
0.32 mA/MHz = 2.17 mA.
Table 3.1. Global DC Electrical Characteristics (Continued)
–40 to +85 °C, 25 MHz System Clock unless otherwise specified.
Parameter Conditions Min Typ Max Units