Specifications
Micrel, Inc.
KSZ8895MQ/RQ/FMQ
Pin Description (Continued)
Pin Number Pin Name Type
(1)
Port Pin Function
(2)
113 PS1 IPD
Serial bus configuration pin.
For this case, if the EEPROM is not present, the
KSZ8895MQ/RQ/FMQ will start itself with the PS[1.0] = 00 default
register values.
Pin Configuration Serial Bus Configuration
PS[1.0] = 00 I
2
C Master Mode for EEPROM
PS[1.0] = 01 SMI Interface Mode
PS[1.0] = 10 SPI Slave Mode for CPU Interface
PS[1.0] = 11 Factory Test Mode (BIST)
114 PS0 IPD Serial bus configuration pin. See “Pin 113.”
115 RST_N IPU Reset the KSZ8895MQ/RQ/FMQ device. Active low.
116 GNDD GND Digital ground.
117 VDDC P 1.2V digital core V
DD
.
118 TESTEN IPD NC for normal operation. Factory test pin.
119 SCANEN IPD NC for normal operation. Factory test pin.
120 NC NC No connect.
121 X1 I
25MHz crystal clock connection/or 3.3V Oscillator input.
Crystal/Oscillator should be ±50ppm tolerance.
122 X2 O 25MHz crystal clock connection.
123 NC NC No connect.
124 NC NC No connect.
125 LDO_O P
When pin126 is pull-up, the Internal 1.2V LDO controller is
enabled and creates a 1.2V output when using an external FET.
When pin126 is pull-down, the pin 125 is tristated.
Note: Use a 200Ω (approximately) resistor between the source
and drain pins on the FET if 3.3V power rail exhibits a slow ramp
(>5ms) when using this internal 1.2V LDO controller. You can also
use an external 1.2V LDO when 3.3V power ramp time is slow.
126 IN_PWR_SEL I
Pull-up to enable LDO_O of pin 125. Pull-down to disable LDO_0.
Note: A 4.3K pull-up and a 1K pull-down resistor divider is
recommended if using the internal 1.2V LDO controller plus an
external MOSFET for 1.2V power.
127 GNDA GND Analog ground.
128 TEST2 NC NC for normal operation. Factory test pin.
Notes:
1. P = Power supply.
I = Input.
O = Output.
I/O = Bidirectional.
GND = Ground.
IPU = Input w/internal pull-up.
IPD = Input w/internal pull-down.
IPD/O = Input w/internal pull-down during reset, output
pin otherwise.
IPU/O = Input w/internal pull-up during reset, output pin
otherwise.
NC = No connect.
2. PU = Strap pin pull-up.
PD = Strap pull-down.
OTRI = Output tristated.
March 12, 2014
22
Revision 1.7