AM3715_17 Datasheet, PDF (126/280 Pages) Texas Instruments – Sitara ARM Microprocessors

AM3715, AM3703
SPRS616F – JUNE 2010 – REVISED AUGUST 2011
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3.4 External Capacitors
To improve module performance, decoupling capacitors are required to suppress the switching noise
generated by high frequency and to stabilize the supply voltage. A decoupling capacitor is most effective
when it is close to the device, because this minimizes the inductance of the circuit board wiring and
interconnects.
3.4.1 Voltage Decoupling Capacitors
Table 3-6 summarizes the Core voltage decoupling characteristics.
3.4.1.1 Core Voltage Decoupling Capacitors
To improve module performance, decoupling capacitors are required to suppress the switching noise
generated by high frequency and to stabilize the supply voltage. A decoupling capacitor is most effective
when it is close to the device, because this minimizes the inductance of the circuit board wiring and
interconnects.
Table 3-6. Core Voltage Decoupling Characteristics
PARAMETER
MIN
TYP
MAX
UNIT
C_{vdd_core} ⁽¹⁾
C_{vdd_mpu_iva} ⁽²⁾
0.6
1.2
1.8
μF
See ⁽²⁾
μF
(1) The typical value corresponds to 2 capacitors of 470 nF, plus 3 capacitors of 100 nF. Except for the decoupling capacitance values, the
PCB rules of the PCB Design Requirements for VDD_MPU_IVA Power Distribution Network for TI OMAP3630, AM37xx, and DM37xx
Microprocessors (SPRABJ7) application note can be used.
(2) For more information regarding the vdd_mpu_iva decoupling capacitance recommendations, see the PCB Design Requirements for
VDD_MPU_IVA Power Distribution Network for TI OMAP3630, AM37xx, and DM37xx Microprocessors (SPRABJ7) application note.
(3) IVA functionality is not supported in the AM37xx device.
3.4.1.2 IO and Analog Voltage Decoupling Capacitors
Table 3-7 summarizes the power supply decoupling capacitor characteristics.
Table 3-7. Power Supply Decoupling Capacitor Characteristics
PARAMETER
C_vdds ⁽¹⁾⁽²⁾
C_{vdds_mem} ⁽¹⁾⁽³⁾
C_{vdds_mmc1} ⁽⁴⁾
C_{vdds_x} ⁽⁴⁾
C_{vdda_dplls_dll} ⁽⁴⁾
C_{vdda_dpll_per} ⁽⁴⁾
C_{vdds_sram} ⁽⁴⁾
C_{vdda_wkup_bg_bb(4)}
C_{vdda_dac} ⁽⁴⁾
(1) In power plan configuration.
(2) The typical value corresponds to 4 capacitors of 100 nF.
(3) The typical value corresponds to 7 capacitors of 100 nF.
(4) In power rail configuration.
MIN
200
350
50
50
50
50
110
240
50
TYP
MAX
400
600
700
1050
100
150
100
150
100
150
100
150
220
330
470
700
100
150
UNIT
nF
nF
nF
nF
nF
nF
nF
nF
nF
126 Electrical Characteristics
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