HS64 Optical Stimulator

Authors:

Jie (Jack) Zhang & Jonathan P. Newman

Version:

1

IO:

Register Access

ONIX ID:

5

ONIX Hubs:

Headstage-64

Description

The HS64 Optical Stimulator is a two-channel high-current LED/laser diode driver for optogenetic stimulation (On Semi CAT4016). The maximal current can be set over a wide (~10 mA to 800 mA) range via an external digital potentiometer. The optical power can then be adjusted linearly and synchronously across both channels within this range over 8-levels per diode load. This sub-circuit is controlled as a single device using parameters similar to a Master8 or PulsePal.

Register Programming

HS64 Optical Stimulator Registers

Address	Name	Access	Time of Effect	POR Value	Reset Action	Description
0x00	NULLPARM	R	N/A	0	None	No effect.
0x01	MAXCURRENT	R/W	Immediate	200	None	Max LED/LD current, (0 to 255 = 800mA to 0 mA. See fig 10 of CAT4016 datasheet)
0x02	PULSEMASK	R/W	Immediate	(others => ‘1’)	None	Bitmask determining which of the (up to 32) channels is affected by trigger
0x03	PULSEDUR	R/W	Immediate	1000	None	Pulse duration, microseconds
0x04	PULSEPERIOD	R/W	Immediate	50000	None	Inter-pulse interval, microseconds
0x05	BURSTCNT	R/W	Immediate	5	None	Burst duration, number of pulses in burst
0x06	IBI	R/W	Immediate	1000000	None	Inter-burst interval, microseconds
0x07	TRAINCNT	R/W	Immediate	1	None	Pulse train duration, number of bursts in train, 0 = continuous
0x08	TRAINDELAY	R/W	Immediate	0	None	Pulse train delay, microseconds
0x09	TRIGGER	R/W	Immediate	0	Default	Trigger stimulation (1 = deliver)
0x0a	ENABLE	R/W	Immediate	0	Default	1: enables the stimulator, 0: stimulator ignores triggers (so that a common trigger can be used)
0x0b	RESTMASK	R/W	Immediate	(others => ‘0’)	None	Bitmask determining the “off” state of the up to 32 channels
0x0c	RESET	R/W	Immediate	0	None	If 1, Reset all parameters to default
0x0d	MINRHEOR	R	Immediate	MINRHEOR	Default	The series resistor between the potentiometer (rheostat) and RSET bin on the CAT4016
0x0e	POTRES	R	Immediate	POTRES	Default	The resistance value of the potentiometer connected in rheostat config to RSET on CAT4016

A graphical register definitions are provided in the following diagrams:

A diagram of the stimulus parameters presented in the HS64 Optical Stimulator Registers table.

Device To Host Data Frames

No frames are transmitted to the host.

Host To Device Data Frames

This device does not accept input frames. All write attempts will fail with an error.