5
CO O N/A Command Output
6
CLKO O N/A Clock output to the chip of next level, for the loop. Pin drive current: 16A
7
PLL_VSS PLL ground
8
PLL_VDD PLL power (0.8V), PLL digital and analog share the same supply
9
VDDIO_08 IO VDD pre-drive, 0.8v
10
LDO_08O LDO 0.8v output, for PLL and IO pre-drive
11
LDO_18I LDO power input voltage range: 1.62v ~ 1.98v
12
VDDIO_18 IO VDD post-drive, 1.8v
13
LDO_18O LDO 1.8v output for IO
14
LDO_25I LDO power input voltage range: 2.2v ~ 2.6v
15
TEMP_P Temperature diode positive output, analog IO. Should be floating when no use.
16
TEMP_N Temperature diode negative output, analog IO. Should be floating when no use.
17
RF O Function 1：RO open drain output. Function 2：SDA0.
18
TF O Function 1：Respond Tx Flag. Function 2：SCL0.
Internal pull down.
19
TEST I N/A 0: Normal mode
1: Test mode
20
ADDR[0:0] I
21
ADDR[1:0] I
22
ADDR[2:0 I
Address Input. Internal pullup
23
ADDR[3:0] I
24
Please I N/A Oscillator input
25
XOUT O N/A Oscillator output
26
There I N/A Command Input. Schmitt input.
27
CI_A I N/A Auxiliary Command Input, add diode and pullup
28
RO O N/A Respond Output
29
BI I
H
Respond Busy Input
30
BI_A I
H
Auxiliary Respond Busy Input, add diode and pullup
31
RST_N I L Reset signal
32
NRST_A I L Auxiliary Reset signal, add diode and pullup
● Above is BM1387 Chip each pin function.
During overhaul
，
Before and after the main test chip 10 A test
（
Five before and after the
chip
：
CLK
、
CO
、
Re
、
BO
、
RST
）；
CORE Voltage
；
LDO-1.8V
、
PLL-0.8V, DC-DC Output
，
and boost 14V Voltage.
Detection method
：
1
）
Do not Plug I O line
，
Plug only 12V
：
DC-DC Output is Around 9v
，
The boost output Voltage is around 14V. Test points must have LCK= 0.9V, RI =
1.8V Voltage
，
Other
test voltages
is 0
；
2
）
Plug in I O
，
when you do not press the test key
，
DC-DC No voltage output with boost
，
after pressing the test key
，
PIC Start working
，
At this time
DC-DC Output PIC, PIC tool test program sets the voltage, rises with the working voltage.
Test program Set the voltage
，
Boost up with the work. With the
output of the system WORK
，
return after operation NONC
。
At this point the normal voltage of each test point should be
：
CLK
：
0.9 in
CO
：
1.6-1.8 V
，
test tool sends work, CO Because it's negative.
，
So the DC level will be pulled low
，
Instantaneous voltage is 1.5 V Around.
RI：1.6-1.8 V，when operating，an abnormal or too low voltage can cause the operator board to be abnormal or force 0 The situation.
BO
：
When no operation is 0V
，
when operating
，
will have 0.1-0.3 V Between the Pulse beats.
RST：1.8 in。 The reset signal is re-exported every time the test key of the fixture is pressed.
When the above test point state, voltage anomaly，please infer the point of failure based on the front and rear circuitry of the test point.
● Visible from list above
：
CLK Signal：By the Chip pin 24 (XIN) ，pin 6 out (CLK0) ，When connecting across voltage domains，by pin 6 out through 100NF Capacitance
connection input to next chip pin 24.
TX Signal
：
Chip pin 27 in (CI_A)
，
Pin 5 out (CO)
；
RX Signal
：
Chip pin 4 back (RI)
，
Pin 28 output (RO)
；
BO Signal
：
Chip pin 30 in (BI_A)
，
Pin 2 output (BO)
；
RST Signal
：
Chip Pin 32 in (NRST_A), Pin 1 output (NRSTO).
5
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