EP7212 Datasheet, PDF (97/136 Pages) Cirrus Logic – HIGH-PERFORMANCE, LOW-POWER SYSTEM-ON-CHIP WITH LCD CONTROLLER AND DIGITAL AUDIO INTERFACE(DAI)

EP7212
Symbol
Parameter
Min
Max
Unit
Conditions
CI/O Transceiver capacitance
8
10
pF
IDD_startup Startup current consumption
µA Initial 100 ms from power up,
32 kHz oscillator not stable,
POR signal at VIL, all other I/O
static, VIH = V_DD ± 0.1 V, VIL =
GND ± 0.1 V
IDD_standby Standby current consumption
300
µA Just 32 kHz oscillator running,
all other I/O static, VIH = V_DD ±
0.1 V, VIL = GND ± 0.1 V
IDD_idle
Idle current consumption
At 13 MHz
At 18 MHz
At 36 MHz
mA Both oscillators running, CPU
4.2
static, LCD refresh active, VIH
6
= V_DD ± 0.1 V, VIL = GND ±
12
0.1 V
IDD_operating Operating current consumption
At 13 MHz
At 18 MHz
At 36 MHz
At 49 MHz
At 74 MHz
mA All system active, running typi-
cal program
14
20
40
50
65
V_DDstandby Standby supply voltage
TBD
V Minimum standby voltage for
state retention and RTC opera-
tion only
NOTE: All power dissipation values can be derived from taking the particular IDD current and multiplying by
2.5 V.
The RTC of the EP7212 should be brought up at room temperature. This is required because the RTC
OSC will NOT function properly if it is brought up at –40°C. Once operational, it will continue to operate
down to –40°C.
A typical design will provide 3.3 V to the I/O supply (i.e., V_DDIO), and 2.5 V to the remaining logic. This
is to allow the I/O to be compatible with 3.3 V powered external logic (i.e., 3.3 V DRAMs).
Pull-up current = 50 µA typical at V_DD = 3.3 volts.
Table 57. DC Characteristics (cont.)
1. The leakage value given assumes that the pin is configured as an input pin but is not currently being driven. An input pin not
driven will have a maximum leakage of 1 µA. When the pin is driven, there will be no leakage.
2. Assumes buffer has no pull-up or pull-down resistors.
3. The leakage value given assumes that the pin is configured as an output pin but is not currently being driven. An output pin
not driven will have leakage between 25µA and 100µA. When the pin is driven, there will be no leakage. Note that
this applies to all output pins and all I/O pins configured as outputs.
DS474PP1
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