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
